fix: call availabilitySet.EnsureBackendPoolDeleted in scaleSet.Ensure…

[nilo19]

…BackendPoolDeleted when using availability sets and vmType=vmss

What type of PR is this?

/kind bug

What this PR does / why we need it:

fix: call availabilitySet.EnsureBackendPoolDeleted in scaleSet.EnsureBackendPoolDeleted when using availability sets and vmType=vmss

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix: call availabilitySet.EnsureBackendPoolDeleted in scaleSet.EnsureBackendPoolDeleted when using availability sets and vmType=vmss

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nilo19

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[lzhecheng]

/retest

[lzhecheng]

/test pull-cloud-provider-azure-e2e-ccm-ipv6-capz
/test pull-cloud-provider-azure-e2e-ccm-dualstack-capz

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[lzhecheng]

/lgtm