[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

Expand Package.resolved snippet

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

If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

Replace this line with the contents of your Podfile.lock!

[paulb777]

The Swift version of the test is successfully running in Firebase 11.