Set MachinePool feature flag to true

[dkoshkin]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Now that CAPI has enabled the MachinePool feature by default and CAPZ is using latest CAPI version with this change, we should do the same here.
See CAPI PR.

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:

Set MachinePool feature flag to true

[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.19%. Comparing base (6cadbde) to head (c7ad119).
Report is 295 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4911   +/-   ##
=======================================
  Coverage   62.19%   62.19%           
=======================================
  Files         201      201           
  Lines       16878    16878           
=======================================
  Hits        10497    10497           
  Misses       5591     5591           
  Partials      790      790           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mboersma]

/release-note-edit release-note Set MachinePool feature flag to true

[mboersma]

/release-note-edit release-note Set MachinePool feature flag to true

[dkoshkin]

Oops, updated the release note :)

[mboersma]

Thanks! I was just trying to get the prow bot to do it, but for some reason the release-note edit command has never been successful for me.

[mboersma]

/test pull-cluster-api-provider-azure-e2e-optional

[willie-yao]

Can we add a note in the docs that this is now enabled by default? https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/docs/book/src/topics/managedcluster.md?plain=1#L59

There are probably a few other places in the docs that need updating as well.

[k8s-ci-robot]

@dkoshkin: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-azure-ci-entrypoint	c7ad119	link	true	/test pull-cluster-api-provider-azure-ci-entrypoint

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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