Generic async reporting + cypress fixes (#667)

Dirty-flag:
* Remove dirty flag logic from "studio-rest-api" area, since it really has nothing to do with Studio REST API.
* Add a new file for it.
* Clean up the annoying error that kept printing upon shutdown.
* The dirty-flag reporting is now a generic async reporting mechanism, with dirty flag as an example.

Cypress:
* Collapse the two uitest scripts.
* Replace electron with chrome for cypress runs.
* Disable two validly failing tests.