At the moment of writing, there can be a situation when time-series view exists, but time-series buckets collection does not. This can happen when the user directly drops time-series buckets collection, for example.

For such situations, we have special handling in multiple places. See listCollections command as an example.

After SERVER-59126 is merged, the time-series view will be always deleted when the time-series buckets collection is deleted. This renders the situation when only time-series view exists impossible. In turn, this means that the special handling is no longer necessary for this case. We should remove it.