Show error message on Google sign-in failure

[jimchamp]

Closes #9019

Shows error message on Google sign-in failures.

Technical

If the response from the /account/login.json call is ok, we immediately redirect to the patron's account page (this is BAU). Otherwise, we display the localized error message in a newly created .note div.

The account/login.json handler has been updated to return a JSON string containing the error short code and the localized error message when a BadRequest is raised. Previously, only the error short code was returned in these cases (it wasn't even JSON encoded...).

Testing

Recommend testing this before #8980 is deployed and tested.

1. Delete an existing IA account that was created using Google sign-in.
2. Re-create the IA account using the same Google account.
3. Attempt to log into OL using Google sign-in. If you see an error like the one in the screenshot, below, this code is working as expected.

Screenshot

Stakeholders

@mekarpeles

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 15.93%. Comparing base (44e250f) to head (38c09fe).

Files	Patch %	Lines
...ary/plugins/openlibrary/js/ia_thirdparty_logins.js	0.00%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9018      +/-   ##
==========================================
- Coverage   15.95%   15.93%   -0.03%     
==========================================
  Files          89       89              
  Lines        4712     4720       +8     
  Branches      822      823       +1     
==========================================
  Hits          752      752              
- Misses       3450     3457       +7     
- Partials      510      511       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mekarpeles]

lgtm