Give users a modal VCS choice when creating a new repository
Ref T10748. Allow the new EditEngine workflow to create repositories by giving the user a modal repository type choice upfront.
(The rest of this flow is still confusing/weird, though.)
- Created a new repository.
Reviewed By: chad
Maniphest Tasks: T10748
Differential Revision: https://secure.phabricator.com/D15813