Show config difference on revert screen

Thinking it probably makes sense to surface the source of the proposed imported config on that screen also ("will be imported from /path/to/config", or perhaps the source component name). Leaving that out of ID for now :)

The config difference screen shows the context of the proposed action, but doesn't permit action

@xurizaemon check the 2.x branch - this was added in https://www.drupal.org/i/3041520 →

Oh thanks Eric, you're right I was back on 1.7 or something.

Closing duplicate of #3041520: Add "Revert to source" link to diff page →