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Update push and pr notification to use Cards v2. (#636) #1085

Job	Run time
signin-sample-spm-build	1m 29s
xcode-27-preview-test (macosx)	1m 13s
signin-sample-pods-build	2m 16s
xcode-27-preview-test (iphonesimulator)	4m 37s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	11m 19s
spm-build-test (macos-15, iphonesimulator)	9m 50s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 3s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	11m 2s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	10m 37s
spm-build-test (macos-15, macosx)	2m 7s
	1h 3m 33s