gtksearchenginetracker3: Pre-fill GFileInfo from query

Provide the minimal info necessary. Improves apparent responsiveness
(since we don't visibly clear and repopulate the list) and saves doing
file stat/reads on every file in the result set.
7 jobs for wip/carlosg/tracker3-3-24 in 16 minutes and 46 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #725493
debian-meson

00:05:17

passed #725490
fedora-autotools

00:06:39

manual #725491
allowed to fail manual
fedora-distcheck
passed #725492
fedora-meson

00:08:00

manual #725495
win32-ps allowed to fail manual
msys2-mingw32-autotools
passed #725494
win32-ps
msys2-mingw32-meson

00:06:56

 
  Docs
passed #725496
reference

00:08:45