[VI-762] Fully destroying User redis on login so that specific fields don't persist between logins

[bosawt]

Summary

• This PR destroys the User redis when a user authenticates either through SSOe or SiS
• Previous to this change, specific attributes on the User model were persisting between logins in certain cases

Related issue(s)

• https://jira.devops.va.gov/browse/VI-762

Testing done

• Logged in with a user, then changed attribute needs_accepted_terms_of_use on User model from false to true and saved the record
• Logged in with the same user again, confirmed needs_accepted_terms_of_use was properly set to false

What areas of the site does it impact?

Authentication

Acceptance criteria

• Before PR changes, authenticate with a user, change needs_accepted_terms_of_use or credential_lock field on User model that's created
• Log in again without logging out (use an incognito browser to be able to create a different session)
• Confirm that the changed field is the original value, not the new value that was set