scripts/_common.py: add a shared Python file to move duplicated code (#12755)

* `scripts/_common.py`: add a shared Python file to move duplicated code

---------

Co-authored-by: Vítor Henrique <87824454+vitorhcl@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
       run: npm ci
 
     - name: Install pip dependencies
-      run: pip install -r requirements.txt -r scripts/pdf/requirements.txt
+      run: pip install -r requirements.txt -r scripts/pdf/requirements.txt -r scripts/test-requirements.txt
 
     - name: Test
       run: npm test