Application: Better handle URIs passed via command line

- Don’t execut any startup logic in ::activate
- HANDLES_OPEN does nothing when HANDLES_COMMAND_LINE is used
3 jobs for master in 4 minutes and 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #19705
run-appdata

00:00:06

passed #19704
run-tests

00:04:10

 
  Build
passed #19706
run-build

00:00:21