That's what pinned repositories are for. It's your opportunity to highlight the projects you're actually proud of. Any half-reasonable prospective employer will look at those first, and probably only those.
And again, if you have nothing worth pinning, there's always the option to leave it off your resume.
Yes, but only if it’s representative of their work. Good luck finding the one kind of sensible library I’ve written in the 100 forks and experiments.