feature: split sonar action from pr action

.github/workflows/pull-request_backend.yml

@@ -108,7 +108,7 @@ jobs:
       - name: Publish integration test results
         uses: EnricoMi/publish-unit-test-result-action@v2
         with:
-          files: "integration-test-results/TEST-*.xml"
+          files: "**/integration-test-results/TEST-*.xml"
           check_name: "Integration Test Results"
 
       - name: Publish unit test results
@@ -131,6 +131,7 @@ jobs:
 
       - name: Compile
         run: mvn -pl tx-models,tx-backend,tx-coverage -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B compile
+
       - name: Verify Sonar Scan
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any