Use interpolated strings 3

[CarloToso]

PR Summary

Replace string.Format() with new string.Create((IFormatProvider? provider, [InterpolatedStringHandlerArgument(nameof(provider))] ref DefaultInterpolatedStringHandler handler).

PR Context

#18974

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[iSazonov]

D:\a\1\s\test\xUnit\csharp\test_Runspace.cs(17,114): error CS8773: Feature 'interpolated string handlers' is not available in C# 9.0. Please use language version 10.0 or greater. [D:\a\1\s\test\xUnit\xUnit.tests.csproj]

@CarloToso Please set C# 11.0 in xUnit.tests.csproj

[iSazonov]

@CarloToso Something wrong in the PR....

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Label : Small Size : +34 -35 Percentile : 27.6% Total files changed: 13 Change summary by file extension: .cs : +33 -34 .props : +1 -1 

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[ghost]

🎉v7.4.0-preview.2 has been released which incorporates this pull request.:tada:

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