Cherry-pick PR #416 to release-v1.3

[thunderboltsid]

Cherry-Pick Details

• Original PR Title: Explicitly set a exponential backoff rate limiter for controller config
• Original PR URL: https://github.com/nutanix-cloud-native/cluster-api-provider-nutanix/pull/416
• Commit SHA: 714c151c10fcb1b6c26031a028198eaf063349c9
• Cherry-Pick Reason: Cherry-picking changes related to rate limiter to release-v1.3 so when a user upgrades from 1.2.5 to 1.3.4, they don't fall back to basic auth

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 69.69697% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 16.58%. Comparing base (814f505) to head (a4bb472).

Files	Patch %	Lines
main.go	64.28%	10 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-v1.3 #432 +/- ## ================================================ + Coverage 15.49% 16.58% +1.08% ================================================ Files 21 21 Lines 2098 2129 +31 ================================================ + Hits 325 353 +28 - Misses 1773 1776 +3 ```

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

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adiantum, 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,thunderboltsid] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[github-actions[bot]]

:white_check_mark: None of your dependencies violate policy!

[thunderboltsid]

/retest