Check if BackgroundTask is still working

[felixerdy]

Capacitor BackgroundTask was removed in Capacitor 3 (https://capacitorjs.com/docs/updating/3-0#background-task-permissions-and-photos-plugins-removed)

We should check if it is still working or not.

It seems like there are some alternatives (ionic-team/capacitor#3032 (comment)) which we should check.

The one by the capawesome-team looks nice, but does not support android at the moment

[felixerdy]

According to the author of the capawesome-team plugin, the Capacitor 2 BackgroundTask did not have an android implementation (see ionic-team/capacitor#3032 (comment)). Therefore, we shouldn't expect any changes regarding its functionality.

I'd suggest to stick with the above mentioned plugin (which is currently used in the feature/capacitor-4 branch and test everything on our devices