[release-1.14] Make AKS extension.Plan optional

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4677

/assign willie-yao

Make AKS extension.Plan optional

[mboersma]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 012ec66fe0ff863e2976dfadd9304cd09a325e3d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.73%. Comparing base (bccd200) to head (b15fa14).
Report is 9 commits behind head on release-1.14.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.14    #4683   +/-   ##
=============================================
  Coverage         62.72%   62.73%           
=============================================
  Files               192      192           
  Lines             15644    15641    -3     
=============================================
- Hits               9813     9812    -1     
+ Misses             5148     5146    -2     
  Partials            683      683           

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

[willie-yao]

/lgtm

[mboersma]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [mboersma]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[mboersma]

/retest

[willie-yao]

/retest

[nojnhuh]

/retest

[mboersma]

/retest

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: 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-apidiff-v1beta1	b15fa14	link	false	/test pull-cluster-api-provider-azure-apidiff-v1beta1

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.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.