[release-1.25] fix: decouple vmss with 0 instance from lb when deleting the service #2528
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: nilo19 The full list of commands accepted by this bot can be found here. The pull request process is described here
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What type of PR is this?
/kind bug
What this PR does / why we need it:
We parse the id of ipConfigs in the lb backend pool to determine what vmss are needed to be decoupled from the lb. But for those with 0 instance, they cannot be decoupled since there is no corresponding ipConfigs in the lb. This PR checks all cached vmss, if it is bound with the lb, we decouple it.
Which issue(s) this PR fixes:
Fixes #2443
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: