[occm]: remove k8s annotations after LB is deleted

[chnyda]

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What this PR does / why we need it: If a service was previously of type LoadBalancer, then was switched to another type (for instance NodePort) and the service is switched again to LoadBalancer : the LoadBalancer fails to be created because the LoadBalancer cannot be found (based on the ID from the annotations).

Which issue this PR fixes(if applicable): fixes #2751

Special notes for reviewers:

Release note:

NONE

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PR needs rebase.

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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