background: Replace deprecated GSimpleAsyncResult with GTask

3 jobs for background-gtask in 3 minutes and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #41038
build

00:01:46

 
  Test
passed #41039
test

00:01:29

 
  Delivery
manual #41040
allowed to fail manual
packaging