Summary:
Ref T182. Ref T9252.
- Adds a "Test" repository operation that just runs `git status` to see if things work.
- Adds a button for it in Edit Repository.
- Shows operation status on the operation detail view to make this workflow work a little better.
- Adds a lot of words. Words words words words.
Test Plan:
- Tested repository operation.
- Read words.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T182, T9252
Differential Revision: https://secure.phabricator.com/D14349
