Updated PhabricatorManiphestTaskTestDataGenerator to assign projects to the generated tasks.

Summary: To assist with T5245: Migrate Maniphest Projects to use edge infrastructure, I have added projects back into the lipsum maniphest generator with the edge infrastructure.

Test Plan: Run the lipsum script for PhabricatorManiphestTaskTestDataGenerator and make sure it generates project data.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D10202