Handle known bugs
CI result json files will in the future contain data on known bugs that a particular test result hits. Handle those by:
- Showing the list of known bugs in the tooltip
- Showing the cell differently for results that do NOT have a bug reported (those are new issues)
- Opening the bug reports when alt-clicking on the result cell
The look of cells without known issues is currently: 1-pixel border around them. Red. Except for incompletes where I'm not capable of making them visible. But the code attempts it at least.
Recommendation: Do not merge this MR before CI results have known bugs, otherwise everything and their brother has a red border.