[Cherry-pick][Refactor][RayCluster] Make ray.io/group=headgroup be constant (#1970)

ray-project / kuberay

A toolkit to run Ray applications on Kubernetes

Apache License 2.0

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Closed kevin85421 closed 6 months ago

kevin85421 commented 6 months ago

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