Summary: Ref T9132. Allow form configurations to include defaults (like default projects, spaces, policies, etc).
Test Plan:
Defaulted "Language" to "Rainbow", plus other adjustments:
{F975746}
{F975747}
{F975748}
{F975749}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T9132
Differential Revision: https://secure.phabricator.com/D14508
