Minor Halt Cleanup

Minor changes:

1. Remove the halt-height init container - I believe this is redundant since the validator height is already checked in the primary container entrypoint. Additionally when the primary container exits after reaching the halt height, the init container is not run so we only ever reach that code path if the pod is recreated while it is at the hard fork height.

2. Update the entrypoint to sleep indefinitely when the halt height is reached, instead of exit 1. This will avoid some noise from the container crashing in a tight loop and it should instead restart at a slower cadence when it fails health check.