Improve event note display in dashboard and project activity views (!8020) · Merge requests · Import/Export Testing Group / gitlabhq_1660611668

Created by: mr-vinn

This change improves the event note display in dashboard and project activity views:

Preserve link href values when the link text is truncated.
Display inline code in the first line of a note.
Only display "..." when the note contents are truncated.
If the note starts with a code block, display the first line instead of an empty <pre/> element.