Closes #36823 COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36823 from yashykt:CsmObsEgFollowup b5d0dcd455039c722b14ede5e569f116f53a6c66 PiperOrigin-RevId: 640632444
Fork the existing CSM example and just keep the observability parts. Closes #36806 PiperOrigin-RevId: 640580476