AzureMachinePoolMachine: avoid setting FailureReason/FailureMessage

[mweibel]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Field will get deprecated in v1beta2, setting this currently avoids the Machine from being reconciled at all which does not make sense in this case because a Failed provisioningState is not necessarily terminal

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 #5303

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

avoids marking an AzureMachinePoolMachine as terminal failure on provisioning failure. This ensures potential recovery from provisioning failure is handled correctly.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mweibel. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.87%. Comparing base (df608bd) to head (4abd50b).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5558      +/-   ##
==========================================
+ Coverage   52.86%   52.87%   +0.01%     
==========================================
  Files         272      272              
  Lines       29474    29472       -2     
==========================================
+ Hits        15582    15584       +2     
+ Misses      13080    13076       -4     
  Partials      812      812              

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[mboersma]

/ok-to-test

[mboersma]

@mweibel you may need to rebase this now that #5565 has merged to get the Netlify / docs tasks to pass. Sorry about that!