Theia: run embedded slapos in a service + bash completions + upate to 1.8.0

See merge request !866
3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:28:41

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:41:50

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

00:01:57