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Update push and pr notification to use Cards v2. #1081

Job	Run time
signin-sample-spm-build	2m 30s
spm-build-test (macos-15, macosx)	1m 40s
spm-build-test (macos-15, iphonesimulator)	4m 41s
pod-lib-lint (macos-15, GoogleSignIn.podspec)	9m 4s
signin-sample-pods-build	1m 43s
xcode-27-preview-test (iphonesimulator)	5m 49s
xcode-27-preview-test (macosx)	1m 22s
pod-lib-lint (macos-15, GoogleSignIn.podspec, --use-static-frameworks)	9m 37s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec)	9m 48s
pod-lib-lint (macos-15, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	9m 34s
	55m 48s