Remove server side limit on policy control names

Summary: Fixes T12367. CSS here already truncates (or should have been) and is generally more effective. Remove the unneeded server side truncation. Any other UI place these render?

Test Plan: Set Policy to a group name of "Stanford University: Alumni Association and Friends" and see better truncation.

Reviewers: epriestley, eliaspro

Reviewed By: epriestley, eliaspro

Subscribers: eliaspro, Korvin

Maniphest Tasks: T12367

Differential Revision: https://secure.phabricator.com/D17479