Fix registration errors from xauthn

[mekarpeles]

Closes #10035
Closes #10045

The errors in get_login_error need to be updated to include bad_email, bad_password

https://github.com/internetarchive/openlibrary/blob/master/openlibrary/plugins/upstream/account.py#L64-L98

@jimchamp can you also investigate whether we may be able to add errors using the add_flash_message (some are currently hidden on the page) as per #10045 ?

Technical

Testing

Screenshot

Stakeholders

[jimchamp]

get_login_error now returns new values:

Error Code	Error Message
bad_password	Password requirements not met.
bad_email	Email provider not recognized.
Default "catch-all" case	Request failed with error code: ${error_code}

Here are screenshots from my local environment:

Account login page with bad_password message.

Account sign-up page with `bad_email message.

Important to note:
If an error occurs during a Google sign-in attempt, a flash message is not displayed. I recommend that we add this in a separate PR, in order to expedite a solution for our most widely encountered account creation issues.
#10404 could also be addressed in this separate PR.

[mekarpeles]

[mekarpeles]

Tested also w/ reasonable credentials