grltrackerwrapper: Batch Tracker queries

Instead of doing one query per change signal, do a query with a batch of
changes in one go. This hugely outperforms the previous code.
4 jobs for wip/mschraal/tracker-changed-signal in 10 minutes and 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Check
passed #357570
flake8

00:02:52

 
  Build Flatpak
passed #357571
flatpak

00:06:28

 
  Deploy
passed #357572
review

00:00:53

passed #357573
allowed to fail manual
stop_review

00:00:30