Ensure IP is set for Azure internal loadbalancer

[feiskyer]

What this PR does / why we need it:

Internal Load Balancer created and associated with availability set but no target network ip configurations on Azure. And kube-controller-manager would panic because of nil pointer dereference.

This PR ensures it is set correctly.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #59046

Special notes for your reviewer:

Should cherry-pick to v1.9

Release note:

Ensure IP is set for Azure internal load balancer.

[feiskyer]

/kind bug

[karataliu]

Ideally we might try evaluating LB result from CreateOrUpdateLBWithRetry to save a get call.

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, karataliu

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[feiskyer]

Ideally we might try evaluating LB result from CreateOrUpdateLBWithRetry to save a get call.

We may add this when adding caches.

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here.

[brendandburns]

We should cherry-pick this into 1.9.x...

[brendandburns]

Created #59277

[k8s-cherrypick-bot]

Commit found in the "release-1.9" branch appears to be this PR. Removing the "cherrypick-candidate" label. If this is an error find help to get your PR picked.