Truncate and scroll task graph tables instead of fitting task titles to the display

Summary: Fixes T11676. Instead of trying to fit task titles to the display, truncate them and let the table scroll.

Test Plan:
Table now scrolls when cramped:

{F1843396}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11676

Differential Revision: https://secure.phabricator.com/D16583