removed Codecov workflow (not working anymore, other workflow required) (#3230)

see #3107

.github/workflows/codecov-test-suites.yaml

@@ -1,35 +0,0 @@
-# This workflow runs the automated test and uploads the coverage results to codecov.io
-# For more information see: https://github.com/codecov/codecov-action
-
-name: "Run Codecov Tests"
-
-on:
-  push:
-    branches: [master, develop]
-  pull_request:
-    branches: [master, develop]
-
-permissions:
-  contents: read
-
-jobs:
-  run-and-upload-coverage-report:
-    runs-on: ubuntu-latest
-    timeout-minutes: 30
-    steps:
-      - name: "Checkout code"
-        uses: actions/checkout@v4
-      - name: "Install dependencies"
-        run: |
-          npm ci
-      - name: "Run coverage"
-        run: |
-          Xvfb :99 -screen 0 1024x768x16 &
-          export DISPLAY=:99
-          touch css/custom.css
-          npm run test:coverage
-      - name: "Upload coverage results to codecov"
-        uses: codecov/codecov-action@v3
-        with:
-          files: ./coverage/lcov.info
-          fail_ci_if_error: true