Support parsing of test output and display status for builds

This is created after I sort of segwayed the discussion of #990 (closed) . I commented:

I guess this whole comment-section is segwaying into a "please give us parsing of test output" feature request. I am +1 for both displaying test output and having the option of storing build artifacts for failed builds.

Support for TAP-parsing would be fantastic, as TAP has great support across languages. The TestAnything-website has some good information on using TAP with various languages.

The abovementioned is something I would love to see. If Gitlab could parse TAP output and give a simple overview then that would be great. The links I have provided gives some information on use in a couple of popular languages.