[release/5.0] Remove the certificate allowlist for nupkg verification. #6595
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Description
release/5.0 port of #6593 to unblock signing validation
Customer Impact
signing validation jobs will fail
Regression
No, a cert update + not knowing a lot about this particular allowlist came back to bite us when a new certificate came into play
Risk
Low. This removes some extra validation that NuGet confirmed is not necessary, and a test build of arcade master succeeded with the same change: https://dev.azure.com/dnceng/internal/_build/results?buildId=892591&view=results
Workarounds
repositories can disable signing validation altogether, which would be dangerous