Upgrade django-allauth to 0.57.0

[LMNTL]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes

Notes

This PR bumps the version of django-allauth from 0.54.0 to 0.57.0 (changelog). The major benefit is that SSO providers are able to be configured directly from the django admin, instead of through environment variables.

Since the provider_id field is required by the {% provider_login_url %} field, and the model itself can't be changed from our side, this PR also makes the provider_id field mandatory in the allauth admin.

[notion-workspace]

Upgrade django-allauth

[notion-workspace]

Use allauth.account.middleware.AccountMiddleware

[notion-workspace]

Refactor or remove hack to get providers from env vars

[notion-workspace]

Test with different providers

[notion-workspace]

Make provider_id required in django admin

[notion-workspace]

Replace provider_login_url template tag with something that works

[notion-workspace]

Replace provider_login_url template tag with something that works

[bufke]

1. Create two open id providers. In my test one was Azure and the other was junk.
2. Go to http://localhost/accounts/login/

MultipleObjectsReturned at /accounts/login/

You could probably develop a unit test for this as I don't think it matters what the social apps are. They can be fake junk as long as they are oidc.

[bufke]

IMO if we are blocking in django admin, it would be fine to remove the "Please do not use kobo as the id value" check. But I'll defer to you.

[LMNTL]

Good point, especially since the code to parse OIDC sub-providers has been removed - it's now guarding against an impossible-to-achieve state (at least for someone not trying to break it.)