R1:e0918883e7f5

Add date awarded to profile badges

Summary: Ref T12270. Adds the date the badge was awarded.

Test Plan: Award a badge, see date on profile badge when card is flipped.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12270

Differential Revision: https://secure.phabricator.com/D17471