Add SkipStatusCodePages property to ApiBehaviorOptions

[aw0lid]

Add SkipStatusCodePages property to ApiBehaviorOptions

Description

This PR implements the approved API proposal to add the SkipStatusCodePages property to ApiBehaviorOptions.

What was done:

• API Extension: Added the SkipStatusCodePages boolean property to ApiBehaviorOptions.
• Application Model Provider: Updated ApiBehaviorApplicationModelProvider to check if SkipStatusCodePages is set to true. When enabled and targeting an API Controller (ApiControllerAttribute), it automatically injects SkipStatusCodePagesMetadata.Instance into the action's route selectors.
• Public API: Updated PublicAPI.Unshipped.txt to include the new property.

Tests Added:

Added unit tests in ApiBehaviorApplicationModelProviderTest.cs covering the following scenarios:

• Verifying metadata is added when SkipStatusCodePages = true on an API Controller.
• Verifying metadata is not added when SkipStatusCodePages = true on a non-API Controller.
• Verifying metadata is not added by default when SkipStatusCodePages = false.

Fixes #45369

[dotnet-policy-service]

Thanks for your PR, @aw0lid. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.