[release-1.16] use token from AzureClusterIdentity for AAD-enabled AKS clusters

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #5071

/assign nojnhuh

Fixed an issue preventing CAPZ from reconciling non-ServicePrincipal-authenticated, AAD-enabled AKS clusters.

[nojnhuh]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5ea77db8843d9cdc2aca2d8b0e3357a122b3614b

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nojnhuh

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 51.20%. Comparing base (88d0f58) to head (a12e7fc).
Report is 1 commits behind head on release-1.16.

Files	Patch %	Lines
azure/services/managedclusters/managedclusters.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.16    #5073      +/-   ##
================================================
+ Coverage         51.13%   51.20%   +0.06%     
================================================
  Files               274      273       -1     
  Lines             24658    24626      -32     
================================================
  Hits              12609    12609              
+ Misses            11260    11228      -32     
  Partials            789      789              

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