Set "importing" flag on repositories created via API
Summary: Ref T6516. We incorrectly fail to set this flag on repositories created via Conduit, which activates too many actions on old commits.
Test Plan:
- Created a new repository via Conduit, verified it was "importing" after creation.
- Created a new repostiory via web UI, verified it was "importing" after creation.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T6516
Differential Revision: https://secure.phabricator.com/D11964