SOCIAL_AUTH_INACTIVE_USER_URL not working as expected

First, thank you for maintaining this library! Below is an issue we're experiencing that's potentially just an outdated mention in the docs, but wanted to see whether this isn't a bug. Also happy to make a PR if this is something that should be fixed.

Expected behaviour

I would expect a user who is logging in via social authentication (in my case Google) who has is_active set to False to be redirected to the URL set in SOCIAL_AUTH_INACTIVE_USER_URL when they try to login the next time. See the docs: https://python-social-auth.readthedocs.io/en/latest/configuration/settings.html

Actual behaviour

Currently nothing is happening. I also searched the python-social-auth codebase and it appears this setting isn't in effect currently, it's only shown in one test and in the docs, but nowhere else in the codebase: https://share.getcloudapp.com/Wnu77mJo

It is used here:

social-core/social_core/actions.py

Lines 87 to 88 in 37dc553

    
           url = setting_url(backend, 'INACTIVE_USER_URL', 'LOGIN_ERROR_URL', 
        
                             'LOGIN_URL')

Thank you!

	url = setting_url(backend, 'INACTIVE_USER_URL', 'LOGIN_ERROR_URL',
	'LOGIN_URL')