Don't show client-side setup prompts until user accounts activate

Summary: Fixes T11198. These are confusing or premature if you aren't an activated user: disabled or unapproved accounts won't be able to act on them.

Test Plan: Changed timezone, went through flow to correct it

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11198

Differential Revision: https://secure.phabricator.com/D16167