deployment: remove grpc-health-probe check for false alarm

[dongx1x]

• grpc-health-probe sometimes gets timeout when heavy traffic, the service will be killed with exit code 137, remove this check.
• revert the test in the example code.

[ruomengh]

Seems this is a known issue in grpc-health-probe project: https://github.com/grpc-ecosystem/grpc-health-probe/issues/33