Create GIDFakeAuthStateMigration #785

Job	Run time
spm-build-test (macos-latest, iphonesimulator)	1m 57s
pod-lib-lint (macos-13, GoogleSignIn.podspec, --use-static-frameworks)	9m 53s
pod-lib-lint (macos-13, GoogleSignIn.podspec)	13m 29s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec)	11m 12s
spm-build-test (macos-latest, macosx)	1m 20s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	12m 23s
	50m 14s

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