fix: 4870 - more verbose error message for detail background tasks

[monsieurtanuki]

What

• The logs for "edit detail" background tasks are now a bit more verbose.
• Will help solving Another issue for background tasks #4870.

Part of

• Another issue for background tasks #4870

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (b91a784) 9.77% compared to head (67eb592) 9.77%.

Files	Patch %	Lines
...th_app/lib/background/background_task_details.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #4877   +/-   ##
=======================================
  Coverage     9.77%   9.77%           
=======================================
  Files          313     313           
  Lines        15976   15976           
=======================================
  Hits          1561    1561           
  Misses       14415   14415           

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[monsieurtanuki]

Thank you @teolemon for your review!