[RayService] Always check the readiness of head Pods for both pending / active clusters if cluster exists #2783
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Why are these changes needed?
Originally, if both active and pending clusters exist, only the head Pod of the pending cluster will have its status checked. That is, if the active cluster's head Pod's serve status fails during the upgrade process, it will not be detected in time.
This PR checks the readiness of head Pods for both pending / active clusters if exist.
Related issue number
Checks