Cherry-pick PR #436 to release-v1.3

[thunderboltsid]

Cherry-Pick Details

• Original PR Title: Add a watch on CAPI cluster in NutanixMachineReconciler
• Original PR URL: https://github.com/nutanix-cloud-native/cluster-api-provider-nutanix/pull/436
• Commit SHA: dc98d5eed212b0b0fb4c052dd871837a6aadd3dc
• Cherry-Pick Reason: Ensuring we react to CAPI Cluster events in NutanixMachine controller

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 18.50%. Comparing base (452ad29) to head (4effc2b).

Files	Patch %	Lines
controllers/nutanixmachine_controller.go	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-v1.3 #441 +/- ## ================================================ + Coverage 17.84% 18.50% +0.65% ================================================ Files 22 22 Lines 2146 2156 +10 ================================================ + Hits 383 399 +16 + Misses 1763 1757 -6 ```

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[nutanix-cn-prow-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adiantum, deepakm-ntnx, thunderboltsid

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/nutanix-cloud-native/cluster-api-provider-nutanix/blob/release-v1.3/OWNERS)~~ [adiantum,deepakm-ntnx,thunderboltsid] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[thunderboltsid]

/retest

[github-actions[bot]]

:white_check_mark: None of your dependencies violate policy!

[thunderboltsid]

/test e2e-k8s-upgrade