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Update push and pr notification to use Cards v2. #1082

Job	Run time
signin-sample-pods-build	2m 6s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	10m 21s
xcode-27-preview-test (iphonesimulator)	5m 18s
spm-build-test (macos-15, iphonesimulator)	2m 44s
xcode-27-preview-test (macosx)	1m 18s
spm-build-test (macos-15, macosx)	2m 8s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	15m 44s
signin-sample-spm-build	1m 49s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	8m 46s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	8m 42s
	58m 56s