Release shared lock after ensuring internal health check

[TortillaZHawaii]

Because of the defer the shared resources mutex was locked even after the shared resource - health check - was provisioned. When provisioning multiple LBs, consequent ones would be waiting for the lock to be released, slowing down consequent ensure operations.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
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[k8s-ci-robot]

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[TortillaZHawaii]

/unassign @jiahuif
/unassign @jpbetz

/assign @mmamczur

[TortillaZHawaii]

/uncc @jiahuif @jpbetz

[k8s-ci-robot]

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