reconcile kubeconfig for AzureASOManagedControlPlane

[nojnhuh]

What type of PR is this?
/kind feature

What this PR does / why we need it:

This PR reconciles the kubeconfig Secret for an AzureASOManagedControlPlane.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #4713

Special notes for your reviewer:

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[codecov]

Codecov Report

Attention: Patch coverage is 76.31579% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 62.35%. Comparing base (292d84c) to head (dd11cff).

Files	Patch %	Lines
...trollers/azureasomanagedcontrolplane_controller.go	76.31%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4772      +/-   ##
==========================================
+ Coverage   62.32%   62.35%   +0.03%     
==========================================
  Files         196      196              
  Lines       16154    16192      +38     
==========================================
+ Hits        10068    10097      +29     
- Misses       5357     5362       +5     
- Partials      729      733       +4     

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[jackfrancis]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: cb2777c35d639c1ee11a52b341f813a7b038972c

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis

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