[TASK] Add karma-coverage and karma-junit-reporter

To get junit compatible results and code coverage
reports that can be understood by CI systems this
patch adds dependencies to karma-coverage and
karma-junit-reporter. It also adds the necessary configuration.

Change-Id: I27ae2e7e6aecf3271d21c1ccff9f8458092cc5e5
Releases: master
Resolves: #76730
Reviewed-on: https://review.typo3.org/48634


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>