feature: split sonar action from pr action

.github/workflows/pull-request_backend.yml

@@ -72,6 +72,16 @@ jobs:
 
       - name: Run unit & integration tests
         run: mvn -pl tx-models,tx-backend,tx-coverage -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B verify
+      - name: Upload integration test results
+        uses: actions/upload-artifact@v3
+        with:
+          name: integration-test-results
+          path: "${{ github.workspace }}/tx-backend/target/failsafe-reports"
+      - name: Upload unit test results
+        uses: actions/upload-artifact@v3
+        with:
+          name: unit-tests-results
+          path: "**/surefire-reports/"
 
   Sonar:
     needs: Test