feat(kubectl-plugin): Add clusterTimeout flag support for job submit

[martynas-subonis]

Why are these changes needed?

kubectl ray job submit currently hardcodes clusterTimeout to 120s, causing failures when RayJob triggers slow node pool scaling (e.g., cloud environments taking ~10 min). This PR makes clusterTimeout configurable to better support submissionMode: InteractiveMode in scaling scenarios.

Related issue number

Closes issue #3900

Checks

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

[martynas-subonis]

Hey @kevin85421 and @win5923 👋 Any follow-up thoughts on this change?

[peter-castelion]

Any word on this PR by chance?

[andrewsykim]

Left a few comments, good to merge after that