feat(controller)!: Remove default category creation and deletion

[thunderboltsid]

CAPX should not be concerned with creating and deleting categories. CAPX consumers should create any category they deem necessary and add it via "additionalCategories" field on NutanixMachine CR.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 34.45%. Comparing base (ce22e6b) to head (9eb0a9f).

Files	Patch %	Lines
controllers/nutanixmachine_controller.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #471      +/-   ##
==========================================
+ Coverage   31.14%   34.45%   +3.31%     
==========================================
  Files          14       14              
  Lines        1477     1335     -142     
==========================================
  Hits          460      460              
+ Misses       1017      875     -142     

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