[RTDB] Fix Fatal Exception: FirebaseDatabasePersistenceFailure

[paulb777]

Fix #4493

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[paulb777]

/gemini review

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Code Review

This pull request addresses a FirebaseDatabasePersistenceFailure fatal exception by setting appropriate file protection attributes when creating the persistence directory. This change allows directory creation even when the device is locked. Additionally, the error reporting is improved by including the underlying NSError in the thrown exception, and the logic is made more robust by logging a warning instead of crashing if setting the 'do not backup' attribute fails. A new unit test has been added to verify the correct file protection attribute is set. The changes are well-implemented and address the issue effectively. I have one minor suggestion to enhance code safety.

[ncooke3]

When the directory already exists, it doesn't sound like the file protection attribute will be updated: true if createIntermediates is set and the directory already exists (from docs).

To handle this case, I think we need to instead set the attribute via this API: https://developer.apple.com/documentation/foundation/filemanager/setattributes(_:ofitematpath:)?language=objc