fix(ci): Resolve Xcode version issues for messaging and (pre)release workflows

[ncooke3]

At least a step in the right direction.

Manual testing (Still in-progress):

• release: https://github.com/firebase/firebase-ios-sdk/actions/runs/17109745202
• prerelease: https://github.com/firebase/firebase-ios-sdk/actions/runs/17076794593

Fix #15226

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[paulb777]

Looks like scripts/test_quickstart.sh needs an Xcode version update

[andrewheard]

Thanks, Nick!