Removing WCT 7.x references (#41733)

## Summary of the Pull Request

This PR introduces the following changes:
- Replace the MarkdownTextBlock with the latest version in
CommunityToolkit Labs, and removing the 7.x version.
- Replacing WrapPanel from 7.x with the 8.0 version.
- Replacing converters from 7.x with the 8.0 version.
- Remove unused namespaces related to the Toolkit

No visual or behavior changes, except for the release notes that now
look better :):

Before:
<img width="678" height="906" alt="image"
src="https://github.com/user-attachments/assets/8b3ac267-b4cd-499c-8e16-d8420a176a4a"
/>


After:
<img width="846" height="881" alt="image"
src="https://github.com/user-attachments/assets/cb4f2d85-0c23-4263-80d6-28c2ab403704"
/>


<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

---------

Co-authored-by: Gordon Lam <73506701+yeelam-gordon@users.noreply.github.com>
Co-authored-by: Gordon Lam (SH) <yeelam@microsoft.com>

src/modules/cmdpal/Microsoft.CmdPal.UI/Controls/ShortcutControl/ShortcutDialogContentControl.xaml

@@ -4,8 +4,8 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:Microsoft.CmdPal.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:labToolkit="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
     x:Name="ShortcutContentControl"
     mc:Ignorable="d">
     <Grid MinWidth="498" MinHeight="220">
@@ -66,7 +66,7 @@
                     IsTabStop="{Binding ElementName=ShortcutContentControl, Path=IsWarningAltGr, Mode=OneWay}"
                     Severity="Warning" />
             </Grid>
-            <labToolkit:MarkdownTextBlock
+            <tkcontrols:MarkdownTextBlock
                 x:Uid="InvalidShortcutWarningLabel"
                 Background="Transparent"
                 FontSize="12"

src/modules/cmdpal/Microsoft.CmdPal.UI/Controls/ShortcutControl/ShortcutWithTextLabelControl.xaml

@@ -4,8 +4,8 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:Microsoft.CmdPal.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:labToolkit="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
     d:DesignHeight="300"
     d:DesignWidth="400"
     mc:Ignorable="d">
@@ -36,7 +36,7 @@
                 </DataTemplate>
             </ItemsControl.ItemTemplate>
         </ItemsControl>
-        <labToolkit:MarkdownTextBlock
+        <tkcontrols:MarkdownTextBlock
             Grid.Column="1"
             VerticalAlignment="Center"
             Background="Transparent"

src/modules/cmdpal/Microsoft.CmdPal.UI/ExtViews/ContentPage.xaml

@@ -11,22 +11,20 @@
     xmlns:converters="using:CommunityToolkit.WinUI.Converters"
     xmlns:coreViewModels="using:Microsoft.CmdPal.Core.ViewModels"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-    xmlns:labToolkit="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
     xmlns:local="using:Microsoft.CmdPal.UI"
-    xmlns:markdownTextBlockRns="using:CommunityToolkit.WinUI.Controls.MarkdownTextBlockRns"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:toolkit="using:CommunityToolkit.WinUI.UI.Controls"
+    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
     xmlns:viewModels="using:Microsoft.CmdPal.UI.ViewModels"
     Background="Transparent"
     mc:Ignorable="d">
 
     <Page.Resources>
         <ResourceDictionary>
-            <markdownTextBlockRns:MarkdownThemes
+            <tkcontrols:MarkdownThemes
                 x:Key="DefaultMarkdownThemeConfig"
                 H3FontSize="12"
                 H3FontWeight="Normal" />
-            <labToolkit:MarkdownConfig x:Key="DefaultMarkdownConfig" Themes="{StaticResource DefaultMarkdownThemeConfig}" />
+            <tkcontrols:MarkdownConfig x:Key="DefaultMarkdownConfig" Themes="{StaticResource DefaultMarkdownThemeConfig}" />
 
             <StackLayout
                 x:Name="VerticalStackLayout"
@@ -52,8 +50,7 @@
 
             <DataTemplate x:Key="MarkdownContentTemplate" x:DataType="viewModels:ContentMarkdownViewModel">
                 <Grid Margin="0,4,4,4" Padding="12,8,8,8">
-                    <labToolkit:MarkdownTextBlock
-                        Background="Transparent"
+                    <tkcontrols:MarkdownTextBlock
                         Config="{StaticResource DefaultMarkdownConfig}"
                         Text="{x:Bind Body, Mode=OneWay}"
                         UseEmphasisExtras="True"
@@ -69,10 +66,7 @@
 
             <DataTemplate x:Key="NestedMarkdownContentTemplate" x:DataType="viewModels:ContentMarkdownViewModel">
                 <Grid>
-                    <labToolkit:MarkdownTextBlock
-                        Background="Transparent"
-                        Config="{StaticResource DefaultMarkdownConfig}"
-                        Text="{x:Bind Body, Mode=OneWay}" />
+                    <tkcontrols:MarkdownTextBlock Config="{StaticResource DefaultMarkdownConfig}" Text="{x:Bind Body, Mode=OneWay}" />
                 </Grid>
             </DataTemplate>
 

src/modules/cmdpal/Microsoft.CmdPal.UI/Pages/ShellPage.xaml

@@ -10,9 +10,8 @@
     xmlns:cpcontrols="using:Microsoft.CmdPal.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:help="using:Microsoft.CmdPal.UI.Helpers"
-    xmlns:labToolkit="using:CommunityToolkit.Labs.WinUI.MarkdownTextBlock"
-    xmlns:markdownTextBlockRns="using:CommunityToolkit.WinUI.Controls.MarkdownTextBlockRns"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
     xmlns:toolkit="using:CommunityToolkit.WinUI.Controls"
     xmlns:ui="using:CommunityToolkit.WinUI"
     xmlns:viewModels="using:Microsoft.CmdPal.UI.ViewModels"
@@ -147,11 +146,11 @@
                     </ItemsControl>
                 </StackPanel>
             </DataTemplate>
-            <markdownTextBlockRns:MarkdownThemes
+            <tkcontrols:MarkdownThemes
                 x:Key="DefaultMarkdownThemeConfig"
                 H3FontSize="12"
                 H3FontWeight="Normal" />
-            <labToolkit:MarkdownConfig x:Key="DefaultMarkdownConfig" Themes="{StaticResource DefaultMarkdownThemeConfig}" />
+            <tkcontrols:MarkdownConfig x:Key="DefaultMarkdownConfig" Themes="{StaticResource DefaultMarkdownThemeConfig}" />
         </ResourceDictionary>
     </Page.Resources>
 
@@ -422,7 +421,7 @@
                             TextWrapping="WrapWholeWords"
                             Visibility="{x:Bind ViewModel.Details.Title, Converter={StaticResource StringNotEmptyToVisibilityConverter}, Mode=OneWay}" />
 
-                        <labToolkit:MarkdownTextBlock
+                        <tkcontrols:MarkdownTextBlock
                             Grid.Row="2"
                             Margin="0,4,0,24"
                             Background="Transparent"

src/modules/registrypreview/RegistryPreview/RegistryPreviewXAML/MainWindow.xaml

@@ -4,9 +4,6 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:tk7controls="using:CommunityToolkit.WinUI.UI.Controls"
-    xmlns:tkcontrols="using:CommunityToolkit.WinUI.Controls"
-    xmlns:ui="using:CommunityToolkit.WinUI"
     xmlns:winuiex="using:WinUIEx"
     MinWidth="480"
     MinHeight="320"