fix(ci/cd): add render_grafana_test.py

Author: pragmaxim

.github/workflows/testing.yml

@@ -17,7 +17,8 @@ jobs:
 
       - name: Validate Grafana dashboard sources
         run: |
-          python3 -c "import yaml" 2>/dev/null || python3 -m pip install --user --quiet pyyaml
+          python3 -c "import yaml" 2>/dev/null || python3 -m pip install --user --break-system-packages --disable-pip-version-check --quiet pyyaml
+          python3 contrib/scripts/render_grafana_test.py
           python3 contrib/scripts/render_grafana.py --check
 
       - name: Run unit tests