1ES PT extraction fails: expected copilot-instructions.md missing from dotnet source tarball

[DonnaChen888]

Repro Pipeline:
20260520.24
20260520.22

Repro Branch:
10.0.4xx
10.0.3xx

Error Message:
##[error]1ES PT Internal Error: Errors occurred during archive extraction: [FileNotFoundError("File(s) ['dotnet-10.0.400-preview.0.26270.124/src/msbuild/.github/copilot-instructions.md'] not found in tar archive '/mnt/vss/_work/1/a/artifacts/assets/Release/dotnet-source-10.0.400-preview.0.26270.124.tar.gz'.")]

[mthalman]

Possible fixed by dotnet/dotnet#6769

[akoeplinger]

Unfortunately not, this one scans the right files, I'm tracking the extraction issue in dotnet/dotnet#6742 and pinged 1ESPT.