Summary: Ref T7053. Remove the `envHash` and `envInfo` fields, which are no longer used now that the daemons restart automagically. Depends on D14458.
Test Plan: Saw no more setup issues.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: tycho.tatitscheff, epriestley
Maniphest Tasks: T7053
Differential Revision: https://secure.phabricator.com/D14446
