[FEATURE REQUEST] Refactor K8s roles

[atsikham]

Is your feature request related to a problem? Please describe. The idea of this task is to have K8s-related tasks decoupled from other ones. For PostgreSQL we already have preflight and upgrade tasks in one place.

Describe the solution you'd like Plan and refactor K8s roles.

Describe alternatives you've considered

Additional context

• Related K8s roles: kubernetes_*.
• Shouldn't be done in parallel with K8s upgrade tasks.

---

DoD checklist

• Changelog
  • [ ] updated
  • [ ] not needed
• COMPONENTS.md
  • [ ] updated
  • [ ] not needed
• Schema
  • [ ] updated
  • [ ] not needed
• Backport tasks
  • [ ] created
  • [ ] not needed
• Documentation
  • [ ] added
  • [ ] updated
  • [ ] not needed
• [ ] Feature has automated tests
• [ ] Automated tests passed (QA pipelines)
  • [ ] apply
  • [ ] upgrade
  • [ ] backup/restore
• [ ] Idempotency tested
• [ ] All conversations in PR resolved
• [ ] Solution meets requirements and is done according to design doc
• [ ] Usage compliant with license