ci: conditionally skip python and frontend tests (#12583)

* ci: conditionally skip python tests

* parametrize check script and implement for frontend

* add missing script

* fix incorrect check

* move CHECKS to ARGS and fix typo

* fix SC2086 nit

.github/workflows/superset-frontend.yml

@@ -18,20 +18,31 @@ jobs:
         with:
           persist-credentials: false
           submodules: recursive
+      - name: Check if frontend changes are present
+        id: check
+        env:
+          GITHUB_REPO: ${{ github.repository }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        continue-on-error: true
+        run: ./scripts/ci_check_no_file_changes.sh frontend
       - name: Install dependencies
+        if: steps.check.outcome == 'failure'
         uses: ./.github/actions/cached-dependencies
         with:
           run: npm-install
       - name: lint
+        if: steps.check.outcome == 'failure'
         working-directory: ./superset-frontend
         run: |
           npm run lint
           npm run prettier-check
       - name: unit tests
+        if: steps.check.outcome == 'failure'
         working-directory: ./superset-frontend
         run: |
           npm run test -- --coverage
       - name: Upload code coverage
+        if: steps.check.outcome == 'failure'
         working-directory: ./superset-frontend
         run: |
           bash <(curl -s https://codecov.io/bash) -cF javascript