ci: remove deprecated jobs

The functionality of these jobs exists in the normal
build job now and they are no longer needed.

citemplates@544836ee
3 jobs for master in 46 minutes and 53 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #837807
flatpak
flatpak

00:45:03

passed #837806
flatpak
tests

00:11:54

 
  Deploy
passed #837808
nightly

00:01:48