[testing] improve test coverage visibility

Unit Test Coverage in Diffs

Looking to add test coverage as part of the diff with the PRs, like the screenshot below. Pay attention to the vertical green and red bars to the left to the lines.

You can see a demo PR here. Please note, that the unit test coverage WILL NOT show up in the diffs until the entire pipeline succeeds (including smoke tests)

For more info, click here

Report Units Test to gitlab test pipeline

Also added a new unit test output that informs the gitlab pipeline of unit test results specifically. For an example of this, see here

For more info, click here