Move IDEA plugin diff checking to a separate task

Currently, we check git diff on every project configuration. We need to create a task that checks diff and disables/enables publishing if needed.

Start by locating the IDEA plugin code that checks the git diff during project configuration and identify how publishing is currently enabled or disabled. Move that diff check into a separate task, then verify that publishing state still responds to the diff result without checking it on every configuration.

Written by the indexing model from the issue text.