Follow-up from "Introduce parallelised BitBucket Server Importer"

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The following discussion from !120931 (merged) should be addressed:

• @.luke started a discussion:

  Suggestion (not blocking)

  As a follow-up we should look at whether we can make any or all of these Stage-namespaced workers idempotent.

  For example in this worker, it looks like Project#after_import is already idempotent. But Gitlab::Import::Metrics#track_finished_import may not be. Perhaps either in that method, or in this worker, we could check the project import state to make sure it's not already finished.