Release and dispose the native handles when releasing RequestContext

[mayuki]

No description provided.

[Copilot]

Pull Request Overview

This PR improves the resource cleanup of the request context by properly releasing and disposing the native handle while also updating several tests to validate connection handling and ensure correct disposal of resources.

• Updated test attributes to limit cross-platform execution (Windows only)
• Added middleware to capture connection IDs and to track active connections
• Refactored disposal logic in production code (ResponseContext and RequestContext) to ensure native handles are released appropriately

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/YetAnotherHttpHandler.Test/YetAnotherHttpHandlerTest.cs	Adjusted test attributes for platform-specific execution
test/YetAnotherHttpHandler.Test/TestServerForHttp1AndHttp2.cs	Added middleware to inject a connection ID header
test/YetAnotherHttpHandler.Test/Http2TestBase.cs	Modified disposal of HTTP handler and client, added assertions for connection cleanup
test/YetAnotherHttpHandler.Test/Helpers/TestWebAppServer.cs	Introduced active connections tracking via middleware
src/YetAnotherHttpHandler/ResponseContext.cs	Ensured _tokenRegistration is disposed in all completion methods
src/YetAnotherHttpHandler/RequestContext.cs	Refactored native handle disposal in Release() and removed redundant code from Dispose()

Comments suppressed due to low confidence (1)

test/YetAnotherHttpHandler.Test/YetAnotherHttpHandlerTest.cs:113

• [nitpick] Consider adding a brief comment explaining that the test now explicitly runs only on Windows to clarify the rationale behind the platform-specific condition.

[Fact] and [OSSkipCondition(OperatingSystems.MacOSX | OperatingSystems.Linux)]