Refactor clients/python/tests/e2e and CI

[pcrespov]

### Tasks
- [ ] `_utils.py` should not call `make`. SEE https://github.com/ITISFoundation/osparc-simcore-clients/pull/185
- [ ] refactor `clients/python/test/e2e/ci`
- [ ] organization of test tests runs in 
- [ ] https://github.com/ITISFoundation/osparc-simcore-clients/issues/184