[release-1.10] add transient error handling to AMMP delete

[nojnhuh]

What type of PR is this?
/kind bug
/area managedclusters

What this PR does / why we need it: Manual cherry-pick of #4039

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:

Fixed a bug causing transient errors in AzureManagedMachinePool reconciliation to requeue too aggressively

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (457588c) 54.28% compared to head (a9cc1c6) 54.31%.
Report is 1 commits behind head on release-1.10.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #4048      +/-   ##
================================================
+ Coverage         54.28%   54.31%   +0.02%     
================================================
  Files               186      186              
  Lines             18866    18874       +8     
================================================
+ Hits              10242    10252      +10     
+ Misses             8069     8067       -2     
  Partials            555      555              

Files	Coverage Δ
controllers/azuremanagedmachinepool_controller.go	54.20% <66.66%> (+1.29%)	⬆️

... and 1 file with indirect coverage changes

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[mboersma]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: c5f699b44e585c4fe279fb8298692e0ca6460aa6

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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