Add project tags to workboard cards

Summary: Ref T4863. Add project tags to workboard cards.

Test Plan: {F1053509}

Reviewers: joshuaspence, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Luke081515.2, Korvin

Maniphest Tasks: T4863

Differential Revision: https://secure.phabricator.com/D14935