ci : add more python requirements to copilot-setup-steps (#15289)

* ci : add flake8 and pyright to copilot-setup-steps.yml

* add tools/server/tests/requirements.txt

.github/workflows/copilot-setup-steps.yml

@@ -49,4 +49,5 @@ jobs:
         run: |
           python3 -m venv .venv
           .venv/bin/activate
-          pip install -r requirements/requirements-all.txt
+          pip install -r requirements/requirements-all.txt -r tools/server/tests/requirements.txt
+          pip install flake8 pyright