Update redirect/cancel URIs for repository dialogs

Summary:
Ref T10923. Some of the dialogs ("Deactivate Repository", "Test Automation", etc.) had cancel or redirect URIs which I missed originally.

Go through them and make sure they all point to the right places.

Also removed one unused controller which I missed the first time around.

Test Plan:

• Opened all these dialogs in a new tab with Command-Click.
• Clicked every "cancel" and "submit" button on all of these dialogs.
• Got consistently sent to the place I came from.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10923

Differential Revision: https://secure.phabricator.com/D15867