Summary:
The support form currently has a search form to select a group, but unless the selection is cleared, it won't show you which groups is actually available, which makes it hard for people to select the right group if they don't know up front.
Since the scale of available groups doesn't justify needing a typeahead, converted it to an ordinary dropdown.
An added benefit is that this allows us to remove a large and complicated component we shouldn't be maintaining ourselves, but rather reuse from Ant.
Reviewed By: nikoant
Differential Revision: D26046131
fbshipit-source-id: f499e5848eec8b961b054104c8e3a01567e2801e
f6d8b19001