[Test Coverage Tracking] Added coveralls integration

[fearphage]

Fixes #8246

This needs an admin to setup a https://coveralls.io account and update the referenced repo token in the code.

[JayDi85]

I think it must be like that:
mvn clean jacoco:prepare-agent test jacoco:report jacoco:report-aggregate coveralls:report

Also coveralls must support multi modules project (if not then it must load report from a Mage.Verify project only -- like sonar do, see pom's comment about it).

[fearphage]

[ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report (default-cli) on project mage-root: Processing of input or output data failed: Report submission to Coveralls API failed with HTTP status 422: Unprocessable Entity (Couldn't find a repository matching this job.) -> [Help 1]

@JayDi85 Did you ever click buttons on the coveralls site to add this project?

[JayDi85]

Yes. It sends something: https://coveralls.io/builds/43239474

[fearphage]

Yes. It sends something

That was from the github-actions branch (#8248). This one failed due to the error message above.

[xenohedron]

Closing as per #8246, sonar to be run manually on occasion due to large size of project