Revert "ci: reduce complexity of invoking pytest"

This reverts commit f503dde.

Author: consideRatio

.github/workflows/test.yaml

@@ -160,7 +160,9 @@ jobs:
 
       - name: Run tests
         run: |
-          pytest
+          mkdir build
+          cd build
+          pytest -vv ../tests -c ../pyproject.toml
 
       - name: Upload test reports
         if: always()

pyproject.toml

@@ -182,7 +182,6 @@ src = "labextension/package.json"
 
 [tool.pytest.ini_options]
 cache_dir = "build/.cache/pytest"
-testpaths = ["tests"]
 addopts = [
     "-vv",
     "--cov=jupyter_server_proxy",