fix: add DeleteMetricMillisBehindLatest for error case

[spentakota]

In case of error when getting records there is a need to delete the MillisBehindLatest metric for the specific shard to eliminate inconsistencies with logging the metric. Returning at this point effectively releases the lease for the shard and hence the lease can be potentially acquired by other consumers in the system (Could be from the same pod or
other pods). If the lease is acquired by another consumer in a different pod this metric would continue
to be collected for this shard from the same pod as well as the new pod. To prevent such a situation
delete the metric from this pod so that it is correctly collected.

[vmwclabot]

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• Commit 0c60089 must be signed by spentakota@vmware.com