[3.0 patch] Re-implement SameSite for 2019

[Tratcher]

Cherry pick of #13858 but expanded to account for the 3.0 defaults change from Lax to None. This preserves the old behavior of None for most components using a default value by witching them to -1 (Unspecified). E.g. new CookieOptions() excludes samesite like before unless you explicitly set it.

[HaoK]

Yeah definitely should go with a less specific namespace if we are using it in 3 places now Microsoft.AspNetCore.SuppressSameSiteNone seems fine

[Tratcher]

@aspnet-hello triage https://dev.azure.com/dnceng/public/_build/results?buildId=374762&view=ms.vss-test-web.build-test-results-tab&runId=11472346&resultId=116327&paneView=debug

[Tratcher]

This branch has been updated to be in sync with the others.

Outstanding items:

• Confirm if there is or is not going to be a October patch, and when the branch really opens for November.
• PatchConfig.props.
  • Microsoft.Net.Http.Headers
  • Microsoft.AspNetCore.Http.Abstractions
  • Microsoft.AspNetCore.Http.Features
  • Microsoft.AspNetCore.CookiePolicy

[aspnet-hello]

This comment was made automatically. If there is a problem contact [email protected].

I've triaged the above build. I've created/commented on the following issue(s)
https://github.com/aspnet/AspNetCore-Internal/issues/3156
https://github.com/aspnet/AspNetCore-Internal/issues/2617