Fix a double-prompt for MFA when recovering a password account

Summary:
Depends on D19905. Ref T13222. In D19843, I refactored this stuff but $jump_into_hisec was dropped.

This is a hint to keep the upgraded session in hisec mode, which we need to do a password reset when using a recovery link. Without it, we double prompt you for MFA: first to upgrade to a full session, then to change your password.

Pass this into the engine properly to avoid the double-prompt.

Test Plan:

• Used bin/auth recover to get a partial session with MFA enabled and a password provider.
• Before: double MFA prompt.
• After: session stays upgraded when it becomes full, no second prompt.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13222

Differential Revision: https://secure.phabricator.com/D19906