[Umbrella] Kubectl-plugin to Beta

[chiayi]

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• I had searched in the issues and found no similar feature requirement.

Description

As per https://github.com/ray-project/enhancements/blob/main/reps/2024-05-21-ray-kubectl-plugin.md, umbrella issue to track promotion to Beta

Progress

• [kubectl-plugin] Add kubectl ray create cluster #2607
• [kubectl-plugin] Add kubectl ray delete rayservice/job/cluster #2635
• Add doc for create and delete ray cluster command
• [kubectl-plugin] Add rayjob yaml generation to ray job submit command #2644
• Update doc and add examples for kubectl ray job submit
• Using RayJob with existing Ray cluster #2429
• [Feature][kubectl-plugin] e2e test for 'kubectl ray log' #2486
• [kubectl-plugin] Add e2e test for kubectl ray job submit #2614
• [kubectl-plugin] add --worker-gpu flag for cluster creation #2675
• [WIP][kubectl-plugin] add create workergroup command #2673
• [Feature][kubectl-plugin] kubectl ray logs to support different node types and ray types. #2419
• [Feature][kubectl-plugin] Run port-forward in a goroutine and retry if the connection fails #2388

Are you willing to submit a PR?

• Yes I am willing to submit a PR!