Fix unguarded launch calls on UI scopes (DEV) (#1625)

* Move doBackgroundNoiseCheck call into MainActivity viewmodel and use guarded launch method from viewmodel.

* Move startStopTracing to viewmodel and use guarded launch method.

* Move `schedulePositiveTestResultReminder` from being launched in the fragment to viewmodels (with guarded launch).

* Good morning LINTer

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