mvn sonar task is not including code in UI frontend submodule

mvn sonar:sonar task is not including code files in UI.frontend submodule

### Expected Behaviour
UI frontend code is included as well

### Actual Behaviour
UI Frontend code is not included

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce
mvn clean verify sonar:sonar -Dsonar.host.url= -Dsonar.login=$SONAR_TOKEN -Dsonar.projectKey=Test

#### Platform and Version
Mac OS

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Only pom file is scanned by sonarqube:


Start by running `mvn clean verify sonar:sonar` with the provided Sonar parameters and inspect the Maven module configuration for `UI.frontend`. Compare the Sonar result with the project structure and determine why only the pom file is scanned. Done means the UI frontend code files appear in the SonarQube analysis.

Written by the indexing model from the issue text.