Make PHUITags not break/wrap

Summary: Currently these break at the icon and any whitespace, instead force them to notwrap and stack the display if there are too many large tags. I think we're much more resilient CSS wise now I can't find any hairy edge cases.

Test Plan:
Try to break tags in 50/50 dashboard layouts like Wikimedia

{F1082103}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T10245

Differential Revision: https://secure.phabricator.com/D15143