Add simple CSS components for actions above a list.
Review Request #11043 — Created June 16, 2020 and submitted
This helps to standardize the display of actions above a list through a
djblets-c-config-forms-list-actionscomponent. This is
intentionally very simple, just providing a basic set of classes to use
that can be styled or queried in a consistent way by a consuming
application. These are likely going to be mixed in with other classes
The integrations list (currently the only part of Djblets using this
concept) has been updated to incorporate these classes.
Made sure the styles didn't impact anything on the Integrations page.
Tested this with an upcoming change to the Extensions page.