Sync shared code from aspnetcore

[github-actions]

This PR was automatically generated to sync shared code changes from aspnetcore. Fixes dotnet/aspnetcore#18943

Port of dotnet/aspnetcore#68321 to runtime

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[MihaZupan]

@copilot Fix the build

[Copilot]

@copilot Fix the build

Fixed in 8a5f7ca.

The break was error CS0117: 'SR' does not contain a definition for 'net_http_qpack_invalid_index' — the sync added the string to the aspnetcore-mirrored Common/src/System/Net/Http/aspnetcore/SR.resx, but System.Net.Http generates its SR from src/libraries/System.Net.Http/src/Resources/Strings.resx, which needed the entry added manually (with runtime-appropriate wording, matching how net_http_qpack_no_dynamic_table differs between the two files).

Verified: ./build.sh clr+libs -c Release succeeded (0 errors), and System.Net.Http.Unit.Tests ran 2681 tests with 0 failures, including the new DecodesIndexOutsideStaticTable_Error theory.