Remove github action tests (PR is coming)

Author: rflamary

.github/workflows/pythonpackage.yml

@@ -28,8 +28,3 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics        
-    - name: Test with pytest
-      run: |
-        pip install pytest "pytest-cov<2.6"
-        python setup.py develop
-        python -m pytest -v test/ ot/ --doctest-modules --ignore ot/gpu/ --cov=ot