Deprecated AppPinManager

[nmetulev]

Issue: #1811

PR Type

What kind of change does this PR introduce?

• Refactoring (no functional changes, no api changes)

• Documentation content changes

What is the new behavior?

Per a request from the app model team, the AppPinManager will be deprecated and throw a warning to use the platform APIs. The AppPinManager sample has also been removed from the sample app

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes

Other information

[azchohfi]

@IbraheemOsama Please, just fix the merge conflict and we should be fine.

[windowstoolkitbot]

This PR is linked to unclosed issues. Please check if one of these issues should be closed: #1811