Fine tune Inspector filtering

Do a case-insensitive match, ignore empty strings, make matching words
conjunctive.
5 jobs for <span class="ref-name">wip/geary-inspector</span> in 81 minutes and 4 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #266563
fedora

00:11:41

passed #266564
ubuntu

00:38:55

 
  Test
passed #266565
flatpak

00:41:12

 
  Deploy
passed #266566
review

00:00:30

passed #266567
allowed to fail manual
stop_review

00:00:26