LG-14219: Arrange email as first item in IdV consent screen

[aduth]

🎫 Ticket

LG-14219

🛠 Summary of changes

Updates the consent screen to show email address as the first item when consenting to a partner requesting a verified identity.

This brings consistency with how it behaves for IAL1 authentications, and prepares for updates allowing a user to add or change their preferred email address when consenting to share information with a partner (LG-13001).

The changes also include test coverage for expected sort order of keys in the consent screen. This behavior had already been implemented, but there was no test coverage.

📜 Testing Plan

Verify that email address is shown first when consenting to share identity-verified information with a partner:

1. Have both the IdP and sample application running simultaneously.
2. Go to http://localhost:9292/?ial=2
3. Click "Sign in"
4. Sign in or create an account
5. When prompted to consent to share information, note order of "Email" attribute as first item

👀 Screenshots

Before	After