[VI-918] Updating UserVerifier to take distinct attributes, and to properly propagate mhv uuid

[bosawt]

Summary

• This PR updates UserVerifier functionality so that MHV accounts will properly propagate the MHV UUID when the UserVerifier is called during an MHV SSOe auth

Related issue(s)

• https://jira.devops.va.gov/browse/VI-918

Testing done

• This refactored general UserVerifier functionality, so confirmed that SiS and SSOe authentications still create an appropriate UserVerification in the UserVerifier code
• Confirmed using Mocked Authentication that MHV authentication created a UserVerification

What areas of the site does it impact?

Authentication

Acceptance criteria

• Confirm authenticating with Sign in Service and SSOe still result in a UserVerification getting created or updated when appropriate
• MHV SSOe Auth is difficult to test localhost, so will have to wait until staging to test

[bramleyjl]

Confirmed SSOe & SiS UserVerification creation still functions.

Looks good other than the one comment about removing the user_verifier_object creation in SiS.