Add ResourceExtensions.HasAnnotation methods

[drewnoakes]

Description

Adds two new methods:

• ResourceExtensions.HasAnnoationOfType<T>
• ResourceExtensions.HasAnnotationIncludingAncestorsOfType<T>

Also modify TryGetAnnotationOfType and TryGetAnnotationsIncludingAncestorsOfType to reduce allocations and remove stack-based recursion.

Expand test coverage.

Some XML doc tweaks.

Would be helpful in #6209, where TryGet* is used and the out param discarded.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue:
  • No

Microsoft Reviewers: Open in CodeFlow

[JamesNK]

This is post 9.0? It doesn't seem like an important bug fix.

[drewnoakes]

The idea was that the API would be available for @adamint to consume in #6209, but that's merged now anyway.