[Infra] Improve error message for expired PAT in release workflows

[ncooke3]

Release and prerelease workflows will fail at the beginning of every July due to their respective access tokens expiring. This PR adds a better error message to reduce the amount of time needed to fix.

See improved error messages:

• prerelease: https://github.com/firebase/firebase-ios-sdk/actions/runs/16056261868/job/45311315680#step:6:2863

• release: https://github.com/firebase/firebase-ios-sdk/actions/runs/16056271863/job/45311477348#step:6:2949

Note: I have since updated the error message contents from the screenshots to improve clarity.

#no-changelog

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[andrewheard]

Unfortunate about needing to debug this but the new error messages are nice!