[Auth unit test] testUseUserAccessGroup usually flakes when run on macos-14 via SPM

[paulb777]

Description

The swift-build-run job in spm.yml usually flakes on testUseUserAccessGroup when run on macos-14.

It may be a timing or synchronization issue, since when it succeeds, it takes over 200 milliseconds.

Reenable the test disabled in #12746 after fixing.

Reproducing the issue

https://github.com/firebase/firebase-ios-sdk/actions/runs/8656165601

Firebase SDK Version

10.24.0

Xcode Version

15.3

Installation Method

Swift Package Manager

Firebase Product(s)

Authentication

Targeted Platforms

iOS

Relevant Log Output

Failing tests:
	-[UseUserAccessGroupTests testUseUserAccessGroup]

If using Swift Package Manager, the project's Package.resolved

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Replace this line with the contents of your Package.resolved.

If using CocoaPods, the project's Podfile.lock

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