[Tbc 217] Core refactor for auth flow

[DeltaV93]

Test workflow

Account Creation

• User can create an account
• Member can complete the first step of creating an account
• User can compete the 2nd part of onboarding and the data is saved

Login/Logout Flow

• can a user login to their existing account
• user sees an error message if they don't use the correct login creds
• user can log out of the account using the new endpoint

Password Reset

• user gets an email with password reset instructions
• user can click the link from the email to reset their password
• user can set their new password

[linear]

TBC-217 Apps.Core