use namespace from ray cluster

[KPostOffice]

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• [ ] I've made sure the tests are passing.
• Testing Strategy
  • [ ] Unit tests
  • [ ] Manual tests
  • [ ] Testing is not required for this change

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sutaakar

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/project-codeflare/codeflare-operator/blob/main/OWNERS)~~ [sutaakar] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment