keep stable order of agent pool profiles when reconciling managed cluster

[nojnhuh]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

When we first list the agent pools associated with a managed cluster to include them for the initial create, the nondeterministic order of the list causes some unnecessary updates to the ManagedCluster ASO resource. This change sorts the agent pools by name in the final ASO spec to ensure no unnecessary updates are made.

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

Special notes for your reviewer:

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.26%. Comparing base (fc938f4) to head (5e7c361).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5137      +/-   ##
==========================================
+ Coverage   51.25%   51.26%   +0.01%     
==========================================
  Files         273      273              
  Lines       24651    24654       +3     
==========================================
+ Hits        12634    12639       +5     
+ Misses      11231    11229       -2     
  Partials      786      786              

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[willie-yao]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b38ffa197f4c2d3beb528d55f20a31c310ef3fbf