feat(mtv-warm-cutover): add warm migration cutover

[stevefulme1]

Summary

• Adds new mtv_warm_cutover role and playbook to finish warm migrations by triggering the cutover phase
• Patches the Forklift Migration resource's spec.cutover with a timestamp to initiate the final CBT sync, source VM shutdown, and target VM boot
• Supports targeting migrations by name, label selector, or plan name
• Optional wait-for-completion with configurable retries/delay
• Verifies migration succeeded after cutover completes
• Companion to MFG-214 (PR feat(mtv-migrate): add warm migration plan support #18) which creates the warm migration plan

Resolves

MFG-216 — Finish warm migration step

Usage

mtv_warm_cutover_request:
  # By plan name
  - namespace: openshift-mtv
    plan_name: vmware-host-20260407-0800

  # By specific migration names with scheduled cutover
  - namespace: openshift-mtv
    names:
      - vmware-host-20260407-abc12
    cutover: "2026-04-07T02:00:00Z"

  # By label selector - immediate cutover
  - namespace: openshift-mtv
    label_selectors:
      - migration-batch=wave-1

Test plan

• Verify yamllint passes (confirmed)
• Verify ansible-lint --offline passes production profile (confirmed — 0 failures)
• Integration: trigger cutover on an active warm migration by name
• Integration: trigger cutover by plan name
• Integration: verify cutover with scheduled timestamp
• Integration: verify wait-for-completion detects success/failure
• Verify already-cutover migrations are rejected gracefully

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