ci(gitlab-ci): use templates from a common repository

5 jobs for !25 with topic/default/regenerate_gitlab_ci in 3 minutes and 9 seconds (queued for 11 seconds)
latest merge request
Name Stage Failure
py27 Tests
    from urllib.parse import urlparse
E ImportError: No module named parse
!!!!!!!!!!!!!!!!!!! Interrupted: 7 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 7 error in 1.43 seconds ============================
ERROR: InvocationError for command /builds/cubicweb/cubes/skos/.tox/py27/bin/python -m pytest test (exited with code 2)
___________________________________ summary ____________________________________
ERROR: py27: commands failed
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1