Update Github workflow build & run destinations, fix respective integration tests #805

Job	Run time
spm-build-test (macos-latest, macosx)	1m 32s
spm-build-test (macos-latest, iphonesimulator)	47s
pod-lib-lint (macos-13, GoogleSignIn.podspec)	10m 52s
pod-lib-lint (macos-13, GoogleSignIn.podspec, --use-static-frameworks)	12m 44s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec)	17m 48s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	12m 38s
	56m 21s

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