Add availability set ready condition

[Jont828]

What type of PR is this?

/kind bug
What this PR does / why we need it: Follow up for #1709 and #1861 to add the ready condition for availability sets.

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1709

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:

NONE

[k8s-ci-robot]

Hi @Jont828. Thanks for your PR.

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[Jont828]

@CecileRobertMichon Follow up for adding the ready condition for availability sets

[CecileRobertMichon]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon

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[CecileRobertMichon]

/retest