Update Herald rule creation workflow to use more modern UI elements

Summary: Ref T13480. Creating a rule in Herald currently uses the older radio-button flow. Update it to the "clickable menu" flow to simplify it a little bit.

Test Plan: Created new personal, object, and global rules. Hit the object rule error conditions.

Maniphest Tasks: T13480

Differential Revision: https://secure.phabricator.com/D20956