gitlab-ci

Libraries usually don't use codeception acceptance tests. This is
additionally implied by the misconfiguration of the job: codeception
test requires `prepare translations`, which is always disabled for
libraries. At the moment, simply skip any codecept jobs for
libraries.

Should acceptance tests be introduced to libraries, the whole
dependency graph of jobs should be redesigned.

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>