This makes a handful of changes to the Admin UI for managing

integrations, fixing up some interactions, and leveraging new work in

the Djblets Config Forms UI.
The main integrations configuration template has changed to hard-code

fewer things (making it easier to integrate into the Review Board admin

UI), moving down some of the Django-specific parts into Djblets's base

admin UI template. Some state has also been injected into the template

from the view, providing information necessary for both Django and

Review Board to properly render the Save/Delete buttons for the page

(and
The JavaScript backing the integrations list now makes use of the new

state management and display code for Config Forms list items. This

reduces the work that the template must do, and gets rid of some

now-unnecessary CSS.
It also fixes some display issues with modalbox usage when confirming

deletion of an integration configuration.

All Python and JavaScript unit tests pass.
Manually tested the saving and deletion functionality for an integration

configuration on the configuration page and deletion on the integration

list page.