add support for autoscaling in azuremanagedmachinepools

[zmalik]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Adds support for Autoscaling in the Managed clusters (AKS).
Which issue(s) this PR fixes:
Fixes # #1669

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

added support for cluster-autoscaler for AKS 

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[devigned]

/ok-to-test

[k8s-ci-robot]

Thanks for your pull request. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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It may take a couple minutes for the CLA signature to be fully registered; after that, please reply here with a new comment and we'll verify. Thanks.

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[zmalik]

will rebase from main as don't understand how this PR could cause some test failures

[zmalik]

@CecileRobertMichon I have squashed the commits now and also rebased from main

[zmalik]

/retest

[devigned]

/lgtm

@CecileRobertMichon wdyt?

[CecileRobertMichon]

lgtm besides poolName defaulting

[CecileRobertMichon]

/lgtm
/approve

Thank you @zmalik!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon

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[jsturtevant]

/retest

[CecileRobertMichon]

/retest