Review all open pull requests

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Why are these changes needed?

Comprehensive review of ~100 open PRs in the kuberay repository to identify priority items and provide technical assessment.

Key Findings

High-Priority Bug Fixes (Ready to Merge)

• [Fix][operator] Fix volcano podgroup stuck in inqueue state after rayjob completes #4476: Volcano PodGroup stuck in inqueue after RayJob completes - correct fix via deletion
• [Feature] Get rid of wget dependency #4468: Remove wget dependency for slim Ray images - uses Python urllib instead
• [RayJob] Wait for workers before submitted jobs in sidecar mode #4429: Workers not ready before job submission in sidecar mode
• [Fix][RayJob SidecarMode] Prevent premature job termination during transient head node spikes #4399: Premature job termination during transient head node spikes
• fix: fix too short timeout causing cascading failures #4133: Liveness probe timeout too short (2s → 5s)

Ready Features

• Ray Serve readiness checks only proxy #4480: RayService readiness simplified to HTTP probe only for Serve proxy
• Sidecar submitter contianer template #4477: Custom container template for sidecar submitter
• [Feature][history server] support endpoint /events #4479: History Server /events endpoint with FIFO eviction

Draft/WIP: ~10 PRs including idle cluster termination, RayService rollback support

History Server: ~20 PRs adding endpoints and E2E tests

Dependabot: ~15 dependency update PRs

Related issue number

N/A - Review task

Checks

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

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