[Auth] Fix password reset process for Signin With Apple

[paulb777]

Fix #6091

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[paulb777]

/gemini review

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Code Review

This pull request fixes an issue with the password reset process, particularly for scenarios like Sign-in with Apple where a custom authentication domain is used. The change correctly uses the customAuthDomain as a fallback for the linkDomain in ActionCodeSettings. The implementation is clean and is accompanied by a new unit test. I've suggested an improvement to the tests to cover more edge cases for better robustness. Overall, this is a good change.

[paulb777]

Closing based on #6091 (comment)