[RayJob] Add Cluster Name For Rayjob.

[slfan1989]

Why are these changes needed?

In our online environment, we run over 200 rayjobs daily, and sometimes certain rayjobs encounter issues. Typically, users provide us with two types of information:

They inform us that a specific job named xgboost-rayjob-batch-xxx is failing. In such cases, we can use kubectl describe rayjob xgboost-rayjob-batch-xxx to identify the headnode of this rayjob. By logging into the head pod, we can examine relevant logs and resolve the problem.

Occasionally, users report problems with a particular ray cluster. In these cases, I would like to quickly locate the rayjob running on that ray cluster. Currently, I can only filter operator logs to identify the issue.

I believe it would be helpful if we could print the cluster information associated with a rayjob when users execute kubectl get rayjob. This would expedite problem identification.

I plan to add some additional information for rayjobs so that when we execute kubectl get rayjob -o wide, the cluster information can be displayed.

Related issue number

Checks

• [ ] I've made sure the tests are passing.
• Testing Strategy
  • [ ] Unit tests
  • [ ] Manual tests
  • [ ] This PR is not tested :(

[slfan1989]

@kevin85421 Can you help review this PR? Thank you very much!

[slfan1989]

@kevin85421 Thank you very much for reviewing the code!