[release-1.27] Add flag to enable fast delete of failed VMSS

[willie-yao]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

"Refactor" as a part of fork-upstream realignment. Fork introduces an environment variable AZURE_ENABLE_FAST_DELETE_ON_FAILED_PROVISIONING to enable fast delete of failed VMSS, whereas upstream does this by default.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Question: should this be enabled by default to preserve current behavior upstream?

Add flag to enable fast delete of failed VMSS

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: willie-yao
Once this PR has been reviewed and has the lgtm label, please assign feiskyer for approval. For more information see the Kubernetes Code Review Process.

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

Needs approval from an approver in each of these files:

• cluster-autoscaler/cloudprovider/azure/OWNERS

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

[willie-yao]

/hold

This has a behavior change which I'm not sure if we're allowed to backport. Fast delete wasn't a thing in 1.27 so we should probably skip this change?

[Shubham82]

Hi @willie-yao
We only support the last three releases from the latest release, CA v1.31. The supported releases are CA 1.28-1.30.

[Shubham82]

There will be no patch release for CA 1.27 (see #7315), so you can close this PR.

[willie-yao]

/close

[k8s-ci-robot]

@willie-yao: Closed this PR.

In response to this:

/close

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-sigs/prow repository.

[comtalyst]

There will be no patch release for CA 1.27 (see #7315), so you can close this PR.

This is an improvement PR for Azure provider. It supports LTS and has a different release procedure.

[willie-yao]

/reopen

[k8s-ci-robot]

@willie-yao: Reopened this PR.

In response to this:

/reopen

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-sigs/prow repository.