Improve lint/unit limit, sort, view all, collapse behaviors

Summary:
Ref T8096. Various tweaks here:

• Sort result lists by importance (even lint -- "errors first" seems better than "alphabetical by file", I think?).
• Do sane stuff with display limits.
• Add a "view all" view.
• Don't show a huge table of passing tests in Differential.
• Link to full results.

Test Plan: See screenshots.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8096

Differential Revision: https://secure.phabricator.com/D13407