Resolve "Add CMake option to enable coverage on unit tests"

What does this MR do?

• Add the CMake option COVERAGE_REPORT to enable coverage flags on all DORiE targets.
• Update the CI Pipeline:

  • Enable COVERAGE_REPORT on the build jobs for tests

  • Run gcovr coverage utility as after_script, which runs after the job, even if it fails.

  • The total coverage reported by GitLab is the mean of both coverage values:

    

  • Add job needs such that test jobs can execute as quickly as possible.

Is there something that needs to be double checked?

No

Can this MR be accepted?

• Implemented CMake option COVERAGE_REPORT
• Added/Updated tests:
  • Add coverage report to test:unit-tests and test:system-tests
  • Update job needs
• Added/Updated documentation
• Pipeline passing
• Squash option set
• Delete branch option set
• Added entry to CHANGELOG.md

Related issues

Closes #163 (closed)