[CmdPal][UnitTests] Add/Migrate unit test for Apps and Bookmarks extension (#41238)

<!-- 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
1. Create Apps and Bookmarks ut project.
2. Refactor Apps and Bookmarks. And some interface in these extensions
to add a abstraction layer for testing purpose.
New interface list:
* ISettingsInterface
* IUWPApplication
* IAppCache
* IBookmarkDataSource
3. Add/Migrate some test case for Apps and Bookmarks extension

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## PR Checklist

- [x] Closes: #41239 #41240
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **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

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## Validation Steps Performed

---------

Co-authored-by: Yu Leng <yuleng@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

PowerToys.sln

@@ -788,6 +788,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.CmdPal.Ext.Window
 EndProject
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 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.CmdPal.Ext.Apps.UnitTests", "src\modules\cmdpal\Tests\Microsoft.CmdPal.Ext.Apps.UnitTests\Microsoft.CmdPal.Ext.Apps.UnitTests.csproj", "{E816D7B1-4688-4ECB-97CC-3D8E798F3830}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.CmdPal.Ext.Bookmarks.UnitTests", "src\modules\cmdpal\Tests\Microsoft.CmdPal.Ext.Bookmarks.UnitTests\Microsoft.CmdPal.Ext.Bookmarks.UnitTests.csproj", "{E816D7B3-4688-4ECB-97CC-3D8E798F3832}"
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@@ -2850,6 +2854,22 @@ Global
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+		{E816D7B1-4688-4ECB-97CC-3D8E798F3830}.Debug|x64.Build.0 = Debug|x64
+		{E816D7B1-4688-4ECB-97CC-3D8E798F3830}.Release|ARM64.ActiveCfg = Release|ARM64
+		{E816D7B1-4688-4ECB-97CC-3D8E798F3830}.Release|ARM64.Build.0 = Release|ARM64
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+		{E816D7B1-4688-4ECB-97CC-3D8E798F3830}.Release|x64.Build.0 = Release|x64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Debug|ARM64.Build.0 = Debug|ARM64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Debug|x64.ActiveCfg = Debug|x64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Debug|x64.Build.0 = Debug|x64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Release|ARM64.ActiveCfg = Release|ARM64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Release|ARM64.Build.0 = Release|ARM64
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832}.Release|x64.ActiveCfg = Release|x64
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 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
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@@ -3161,6 +3181,8 @@ Global
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 		{00D8659C-2068-40B6-8B86-759CD6284BBB} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
+		{E816D7B1-4688-4ECB-97CC-3D8E798F3830} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
+		{E816D7B3-4688-4ECB-97CC-3D8E798F3832} = {8EF25507-2575-4ADE-BF7E-D23376903AB8}
 	EndGlobalSection
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