Runtime: Add macOS BigSur to RID graph

[marek-safar]

This time the insertion can be a bit more interesting.

• The version number 11 or 11.0 should be added
• New arm64 architecture was added

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[danmosemsft]

cc @ericstj was telling me we probably should do this now and not wait.

[danmosemsft]

This will also need 2.1 and 3.1 ports right?

[danmosemsft]

@marek-safar , @wfurt told me last week that current builds are 10.16. Are you sure it will be 11?

[wfurt]

It seems like that will be 11 in final release. I'll get it ready.

[safern]

This will also need 2.1 and 3.1 ports right?

Right.

I will be sending helix jobs to a testing helix queue we have to see what comes out as well.

[marek-safar]

@danmosemsft that has changed in beta3. The system version is reported as '11.0' now

[danmosemsft]

Keeping open for port.

[danmosemsft]

these were done https://github.com/dotnet/corefx/pulls?q=is%3Apr+is%3Aclosed+author%3Awfurt

[wfurt]

there is still #41044 and port to 5.0 branch to be done. (3.1 and 2.1 should be OK)