Activate branch analysis in Sonarqube and MR decoration in Gitlab

Activate branch analysis in Sonarqube. GNP-5961.

.gitlab-ci.yml

@@ -66,7 +66,7 @@ test-and-sonarqube:
     - ./gradlew :backend:test --parallel
     - find /tmp/node/*/bin -name node -exec ln -s {} /tmp/node/node \;
     - export PATH="/tmp/node/:$PATH"
-    - ./gradlew sonarqube -x test
+    - ./gradlew sonarqube -x test -Dsonar.branch.name=$CI_COMMIT_REF_NAME
   artifacts:
     reports:
       junit: