Added basic support for Windows App Actions. (#39927)

## Summary of the Pull Request
Adds basic support for finding, listing, and executing Windows App
Actions on files found by the Microsoft.CmdPal.Ext.Indexer extension.

## PR Checklist

- [X] **Closes:** #39926
- [X] **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
- [X] **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

## Detailed Description of the Pull Request / Additional comments
We also update cswin32 to stable version.

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Validated that it doesn't show on older versions of Windows (<26100
insiders) and that it does work on newer version that have the App
Actions runtime.

---------

Co-authored-by: Gordon Lam (SH) <yeelam@microsoft.com>
Co-authored-by: Mike Griese <migrie@microsoft.com>
Co-authored-by: Leilei Zhang <leilzh@microsoft.com>

.pipelines/v2/templates/job-build-project.yml

@@ -102,7 +102,7 @@ jobs:
             ${{ else }}:
               OutputBuildPlatform: ${{ platform }}
   variables:
-    MakeAppxPath: 'C:\Program Files (x86)\Windows Kits\10\bin\10.0.22621.0\x86\MakeAppx.exe'
+    MakeAppxPath: 'C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\MakeAppx.exe'
     # Azure DevOps abhors a vacuum
     # If these are blank, expansion will fail later on... which will result in direct substitution of the variable *names*
     # later on. We'll just... set them to a single space and if we need to, check IsNullOrWhiteSpace.
@@ -335,6 +335,7 @@ jobs:
           /p:VCRTForwarders-IncludeDebugCRT=false
           /p:PowerToysRoot=$(Build.SourcesDirectory)
           /p:PublishProfile=InstallationPublishProfile.pubxml
+          /p:TargetFramework=net9.0-windows10.0.26100.0
           /bl:$(LogOutputDirectory)\publish-${{ join('_',split(project, '/')) }}.binlog
           $(RestoreAdditionalProjectSourcesArg)
         platform: $(BuildPlatform)