Code Quality Inline diff, handle multiple findings

This Issue is the enhancement of the code Quality inline diffs when it comes to multiple findings.

Designs: https://www.figma.com/file/ToYFgYtjveh7ebP7ywzpP2/Inline-security-notifications-in-the-MR-(Copy)?node-id=406%3A28270

Note on Designs, a lot of the features are designed to match the Security MR Widget and not yet implemented. This shouldn't matter too much for now, the idea stay the same and should be implemented for the CodeQuality MR inline-diff indicators. More details on the corresponding Issues.