ci: replace Codecov with SonarCloud scan

Synchronize our projects and move AntiVirus to SonarCloud, too.
Use a dedicated CI step here to process code coverage.

.github/workflows/test.yml

@@ -9,6 +9,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
@@ -18,9 +20,17 @@ jobs:
         run: composer install --no-interaction
       - name: Unit tests
         run: composer test
-      - name: Coverage Report
+      - name: SonarCloud Scan
+        uses: sonarsource/sonarcloud-github-action@master
         if: matrix.php == '8.1'
-        uses: codecov/codecov-action@v3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        with:
+          args: >
+            -Dsonar.organization=pluginkollektiv
+            -Dsonar.projectKey=pluginkollektiv_antivirus
+
   quality:
     runs-on: ubuntu-latest
     steps: