Tweak test execution in github action

Author: tennlee

.github/workflows/python-app.yml

@@ -33,6 +33,6 @@ jobs:
         # editable is necessary as pytest will run against the installed
         # package rather than the local files creating a coverage report of 0%
         pip install -r requirements-dev.txt
-        pytest --cov-report=html --cov=packages/data --cov=packages/utils --cov=packages/pipeline --cov=packages/training
+        pytest --cov=packages/data --cov=packages/utils --cov=packages/pipeline --cov=packages/training