Draft - Run attachment and LFS Object stages in parallel with other stages

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Attachment and LSF objects stages in GitHub Import don't make API calls that consume the API rate limit. Therefore, these stages can run in parallel with the other stages which would decrease overall migration time.

For example, the latest Kubernetes test migration took 79 hours to finish. The attachment stage took 11.5 hours to finish, which represents 14% of the migration time.

Proposed solution