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Update push and pr notification to use Cards v2. #1072

Job	Run time
signin-sample-pods-build	2m 32s
spm-build-test (macos-15, iphonesimulator)	1m 47s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	8m 16s
xcode-27-preview-test (iphonesimulator)	5m 44s
xcode-27-preview-test (macosx)	1m 14s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	9m 54s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	10m 3s
signin-sample-spm-build	1m 34s
spm-build-test (macos-15, macosx)	1m 36s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	7m 40s
	50m 20s