Remove RQ dependency

Author: cunla

.github/actions/test-coverage/action.yml

@@ -21,12 +21,7 @@ runs:
       shell: bash
       run: |
         cd testproject
-        poetry run coverage run manage.py test scheduler --exclude-tag multiprocess
-    - name: Run multiprocess tests with coverage
-      shell: bash
-      run: |
-        cd testproject
-        poetry run coverage run --append manage.py test scheduler --tag multiprocess
+        poetry run coverage run manage.py test --exclude-tag multiprocess scheduler
     - name: Coverage report
       id: coverage_report
       shell: bash