Update various Asana odds-and-ends for "gid" API changes
Ref T13453. Some of the Asana integrations also need API updates.
Depends on D20899.
- Viewed "asana.workspace-id" in Config, got a sensible GID list.
- Created a revision, saw the associated Asana task get assigned.
- Pasted an Asana link I could view into a revision description, saw it Doorkeeper in the metadata.
Maniphest Tasks: T13453
Differential Revision: https://secure.phabricator.com/D20900