auth

add mfa section #3904

Job	Run time
integration-tests	1h 17m 13s
spm (iOS, macos-12)	6m 38s
spm (iOS, macos-13)	2m 50s
pod-lib-lint (FirebaseAuthInterop.podspec, ios, macos-12)	1m 59s
catalyst	4m 44s
spm (tvOS, macos-12)	4m 9s
pod-lib-lint (FirebaseAuthInterop.podspec, ios, macos-13)	2m 7s
quickstart	4m 49s
spm (tvOS, macos-13)	2m 27s
pod-lib-lint (FirebaseAuthInterop.podspec, tvos, macos-12)	2m 35s
spm (macOS, macos-12)	3m 1s
pod-lib-lint (FirebaseAuthInterop.podspec, tvos, macos-13)	1m 51s
spm (macOS, macos-13)	2m 43s
pod-lib-lint (FirebaseAuthInterop.podspec, macos --skip-tests, macos-12)	2m 43s
spm (catalyst, macos-12)	3m 24s
pod-lib-lint (FirebaseAuthInterop.podspec, macos --skip-tests, macos-13)	4m 8s
spm (catalyst, macos-13)	3m 31s
pod-lib-lint (FirebaseAuthInterop.podspec, watchos, macos-12)	1m 51s
spm (watchOS, macos-12)	4m 56s
spm (watchOS, macos-13)	3m 46s
pod-lib-lint (FirebaseAuthInterop.podspec, watchos, macos-13)	1m 42s
pod-lib-lint (FirebaseAuth.podspec, ios, macos-12)	5m 23s
pod-lib-lint (FirebaseAuth.podspec, ios, macos-13)	1h 9m 20s
pod-lib-lint (FirebaseAuth.podspec, tvos, macos-12)	3m 8s
pod-lib-lint (FirebaseAuth.podspec, tvos, macos-13)	4m 50s
pod-lib-lint (FirebaseAuth.podspec, macos --skip-tests, macos-12)	3m 51s
pod-lib-lint (FirebaseAuth.podspec, macos --skip-tests, macos-13)	3m 49s
pod-lib-lint (FirebaseAuth.podspec, watchos, macos-12)	5m 8s
pod-lib-lint (FirebaseAuth.podspec, watchos, macos-13)	4m 57s
auth-cron-only	0s
	4h 3m 33s

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