Making CSWinRt into prop file for c# (#34225)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request

more breaking out stuff

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

- [ ] **Closes:** #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If 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

src/settings-ui/Settings.UI/PowerToys.Settings.csproj

@@ -1,15 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
-    <!-- Look at Directory.Build.props in root for common stuff as well -->
-    <Import Project="..\..\Common.SelfContained.props" />
+  <!-- Look at Directory.Build.props in root for common stuff as well -->
+  <Import Project="..\..\Common.Dotnet.CsWinRT.props" />
+  <Import Project="..\..\Common.SelfContained.props" />
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net8.0-windows10.0.20348.0</TargetFramework>
-    <TargetPlatformMinVersion>10.0.19041.0</TargetPlatformMinVersion>
-    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
     <RootNamespace>Microsoft.PowerToys.Settings.UI</RootNamespace>
     <ApplicationManifest>app.manifest</ApplicationManifest>
-    <RuntimeIdentifiers>win-x64;win-arm64</RuntimeIdentifiers>
     <UseWinUI>true</UseWinUI>
     <EnablePreviewMsixTooling>true</EnablePreviewMsixTooling>
     <WindowsPackageType>None</WindowsPackageType>
@@ -33,23 +30,7 @@
   <ItemGroup>
     <ApplicationDefinition Include="SettingsXAML\App.xaml" />
   </ItemGroup>
-
-  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
-    <NoWarn></NoWarn>
-    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
-    <WarningsNotAsErrors>CA1720</WarningsNotAsErrors>
-    <Optimize>False</Optimize>
-    <DebugType>full</DebugType>
-    <DebugSymbols>true</DebugSymbols>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)'=='Release'">
-    <NoWarn></NoWarn>
-    <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
-    <WarningsNotAsErrors>CA1720</WarningsNotAsErrors>
-    <Optimize>true</Optimize>
-  </PropertyGroup>
+	
 
   <!-- See https://learn.microsoft.com/windows/apps/develop/platform/csharp-winrt/net-projection-from-cppwinrt-component for more info -->
   <PropertyGroup>
@@ -75,7 +56,6 @@
     <PackageReference Include="CommunityToolkit.WinUI.Extensions" />
     <PackageReference Include="CommunityToolkit.WinUI.Converters" />
     <PackageReference Include="CommunityToolkit.WinUI.UI.Controls.Markdown" />
-    <PackageReference Include="Microsoft.Windows.CsWinRT" />
     <PackageReference Include="WinUIEx" />
     <PackageReference Include="Microsoft.WindowsAppSDK" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" />