When creating a repository with EditEngine, allocate it onto a random cluster service
Summary: Ref T10748. This copies existing code in the CreateController which will eventually be removed.
Test Plan:
- Created a new repository with the EditPro workflow.
- Saw it come up into the cluster properly.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10748
Differential Revision: https://secure.phabricator.com/D15835