Enable code coverage for the codebase

[alexflav23]

Steps to complete this ticket:

• Add the sbt-coverage plugin to the build pipeline
• Enable the project with the existing Coveralls integration in Outworkers GitHub.
• Add the sbt-coveralls plugin for Coveralls.io integration.
• Block Pull Requests from being merged to develop branch until code coverage has been reported.
• Add a testWithCoverage command as part of the lifecycle.
• Enable running the testWithCoverage command on a specific Scala version(if building for multiple).