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Update push and pr notification to use Cards v2. #1083

Job	Run time
signin-sample-pods-build	3m 26s
xcode-27-preview-test (macosx)	1m 10s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 6s
xcode-27-preview-test (iphonesimulator)	6m 5s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	11m 24s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	7m 34s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	9m 59s
signin-sample-spm-build	1m 36s
spm-build-test (macos-15, macosx)	2m 20s
spm-build-test (macos-15, iphonesimulator)	2m 51s
	55m 31s