Check nutanixmachine resources when deleting nutanixcluster

[yannickstruyf3]

What this PR does / why we need it:

• Wait for nutanixcluster deletion until all nutanixmachine resources are deleted
• Retry nutanixcluster creation in case of category creation failure instead of raising fatal error.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
N/A

How Has This Been Tested?:

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

- Wait for nutanixcluster deletion until all nutanixmachine resources are deleted
- Retry nutanixcluster creation in case of category creation failure instead of raising fatal error. 

[codecov-commenter]

Codecov Report

Merging #304 (dec2a0b) into main (556905e) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

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@@           Coverage Diff            @@
##            main    #304      +/-   ##
========================================
- Coverage   2.64%   2.62%   -0.02%     
========================================
  Files          4       4              
  Lines        982     989       +7     
========================================
  Hits          26      26              
- Misses       956     963       +7     

Files Changed	Coverage Δ
controllers/nutanixcluster_controller.go	6.79% <0.00%> (-0.31%)	⬇️

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[adiantum]

Any chance to add test cases for the fixes?

[adiantum]

Overall LGTM, just nit

[nutanix-cn-prow-bot]

@yannickstruyf3: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-ncn-1-calico-k8s-v1.26.1	acb0d84	link	false	/test e2e-ncn-1-calico-k8s-v1.26.1

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[thunderboltsid]

/lgtm
/approve

[nutanix-cn-prow-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adiantum, thunderboltsid, yannickstruyf3

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• OWNERS [adiantum,thunderboltsid,yannickstruyf3]

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