Revert "ci-package-builder: Monitor build results from OBS"

Revert "ci-package-builder: Monitor build results from OBS"

This reverts commit 87ef0c7ce68041fb581fb817d467bf7af90634c1.

The changes introduced with this commit added the feature to link OBS
builds to Gitlab CI.

In the change, we have:

obs:
  stage: OBS
  needs:
    - upload
  trigger:
    strategy: depend
    include:
      - artifact: obs.yml
        job: upload

which "needs" upload. Now, as per the limitation of "needs" usage,
it is bound to fail if it points to a job not instantiated

See: https://gitlab.com/help/ci/yaml/README#requirements-and-limitations
for details

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>