HTTP/3 Made alt-used show only on alt-svc redirect (#72669)
* #56876 issue test
* Implemented Alt-Used compliance
* resolved code review
* changed variable name
* removed white spaces
* Update src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
Co-authored-by: Natalia Kondratyeva <knatalia@microsoft.com>
* Update src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
Co-authored-by: Natalia Kondratyeva <knatalia@microsoft.com>
Co-authored-by: iuliaco <t-icorcodel@microsoft.com>
Co-authored-by: Natalia Kondratyeva <knatalia@microsoft.com>