Improve error handling and popups (DEV, EXPOSUREAPP-6518) (#2995)

* Show errors when trying to gain ENS system permission.

* Handle missing ENS components gracefully by defaulting to longer polling delays on temporary errors, and aborting without error on permanent errors (i.e. not installed).

* Introduce "KnownError" concept, to remove some of the error dialog chaos.

* Add wiring to display corona test errors via HomeFragment.

* Fix lints

* Move files into main module that were accidentally placed in tester only module.

* Adjust error title for tests.

* Address PR comments.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>