Add columns for require_reauthentication_to_approve

What does this MR do and why?

Add columns for require_reauthentication_to_approve

• Add columns to migrate require_password_to_approve to a name that will fit authentication on merge requets for password and SAMl SSO alike.

• Refs: #431346

This is part of a larger effort to have the attribute in the backend and API match the current UI, since we've added SAML based MR approval in the past without touching the underlying database/API names.

Changelog: changed

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How to set up and validate locally

1. Run migrations