[Firebase AI] Merge +Coverage files into existing test files

[andrewheard]

• Merged the added +Covergage.swift files in Increase Firebase AI Logic unit test coverage #15126 into the existing test classes.
• Updated SafetyTests to use the same JSONEncoder outputFormatting settings as the other test files for consistency.

#no-changelog

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[paulb777]

Thanks for cleanups!

LGTM on green