Fix rendering of project slugs in tokenizer UI

Summary: Fixes T5659. When building a token after a user selection, we currently use the `value` as the token text, but sometimes that's an internal name which doesn't make much sense to users. For projects, it is now "sluga slugb Proper Display Name". If available, use `displayName` instead.

Test Plan: Typed some projects into a tokenizer, got display names only.

Reviewers: chad, joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Maniphest Tasks: T5659

Differential Revision: https://secure.phabricator.com/D9996