- move tests to inner loop
- include echo middleware in xharness server
- improve doc
- more granular ActiveIssue https://github.com/dotnet/runtime/issues/53592 for lack of TRACE
- more granular ActiveIssue https://github.com/dotnet/runtime/issues/53591 for content on GET/HEAD
- more granular ActiveIssue https://github.com/dotnet/runtime/issues/53874 for HttpRequestMessage.Headers.Host
- more granular ActiveIssue https://github.com/dotnet/runtime/issues/53872 for NPE on System.Net.Http.BrowserHttpHandler
- more granular ActiveIssue https://github.com/dotnet/runtime/issues/53876
- include middleware in Helix correlation payload