Support more transactions types in RepositoryEditEngine
Ref T10748. This supports more transaction types in the modern editor and improves validation so Conduit benefits.
You can technically create repositories via diffusion.repository.edit now, although they aren't very useful.
- Used diffusion.repository.edit to create and edit repositories.
- Used /editpro/ to edit repositories.
Reviewed By: chad
Maniphest Tasks: T10748
Differential Revision: https://secure.phabricator.com/D15740