Remove keychain entries if fresh install #890

Job	Run time
spm-build-test (macos-15, macosx)	2m 24s
spm-build-test (macos-15, iphonesimulator)	3m 3s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	9m 4s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	9m 33s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	7m 4s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	5m 52s
	37m 0s

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