[WIP] ci: ignore network and pipeline tests

WHY IS THIS CHANGE NEEDED?:
- pipeline failed: https://git.ecdf.ed.ac.uk/swain-lab/aliby/aliby/-/jobs/56303
  because ModuleNotFoundError: 'omero'

HOW DOES THE CHANGE SOLVE THE PROBLEM?:
- ci script had redundant lines: it run tests while ignoring network &
  pipeline, then ran tests again with coverage but without ignoring
  these
- ignored network because it requires 'omero'
- ignored pipeline because it requires specific files not accessible now

REFERENCES:
- issue #46

.gitlab-ci.yml

@@ -38,8 +38,7 @@ Local Tests:
   stage: tests
   script:
     # - poetry install -vv
-    - poetry run pytest ./tests --ignore ./tests/aliby/network --ignore ./tests/aliby/pipeline
-    - poetry run coverage run -m pytest
+    - poetry run coverage run -m pytest ./tests --ignore ./tests/aliby/network --ignore ./tests/aliby/pipeline
     - poetry run coverage report -m
     - poetry run coverage xml
   coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'