[release/6.0] Ignore the DuplicateExtension status from macOS 12. #58889
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Backport of #58834 to release/6.0
/cc @bartonjs @vcsjones
Customer Impact
Customers running on macOS 12 with atypical X.509 certificates may get exceptions out of X509Chain.Build.
dotnet/runtime developers and CI will fail running existing tests on macOS 12.
Testing
Caught by an existing test during OS scouting.
Risk
Low (caught by an existing test, following an existing pattern).