Allow non-members to access publicly accessible resources with fine-grained PATs

What does this MR do and why?

Publicly accessible groups and projects are currently inaccessible for non-members with fine-grained Personal Access Tokens, because membership is required when authenticating with fine-grained PATs.

This allows non-members with fine-grained PATs to access publicly accessible project features, similar to legacy PATs.

References

Issue: #586444 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

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