Incompatibility warning card on main screen (EXPOSUREAPP-5464)(COMMUNITY) (#2873)

* Incompatibility warning card on main screen

* Fix lint

* Fix lint further

* Really fix lint

* Refactor BluetoothSupport.kt to be injectable, to allow mocking.

* Unit test draft.

* adapt tests

* tests and refactoring

* tests and refactoring

* screenshots

* add icon

* add dimen again

* change text

* klint

Co-authored-by: Fynn Godau <fynngodau@mailbox.org>
Co-authored-by: chilja <chiljamgossow@gmail.com>