Cherry pick #465 in cloud provider azure to 1.19: Cleanup subnet in frontend IP configs #98288
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What type of PR is this?
/kind bug
What this PR does / why we need it:
Cleanup subnet in frontend IP configs to prevent huge subnet request bodies in some scenarios.
Ref: kubernetes-sigs/cloud-provider-azure#465
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?:
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
/priority critical-urgent
/area provider/azure
/sig cloud-provider
/triage accepted