chore: 2nd try - simplify python dependencies (#27505)

.github/workflows/superset-cli.yml

@@ -52,22 +52,13 @@ jobs:
         continue-on-error: true
         run: ./scripts/ci_check_no_file_changes.sh python
       - name: Setup Python
+        uses: ./.github/actions/setup-backend/
         if: steps.check.outcome == 'failure'
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-          cache: "pip"
-          cache-dependency-path: "requirements/testing.txt"
-      - name: Install dependencies
+      - name: Setup Postgres
         if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
-          run: |
-            apt-get-install
-            pip-upgrade
-            pip install wheel
-            pip install -r requirements/testing.txt
-            setup-postgres
+          run: setup-postgres
       - name: superset init
         if: steps.check.outcome == 'failure'
         run: |