feat: Support Django 5.1's LoginRequiredMiddleware

[adamchainz]

Fixes #4001.

This is just a first pass to add the decorator to the views that I think should be public. I am not sure if a test is required but I also haven't loaded this into a project to check.

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[coveralls]

coverage: 95.799% (-0.005%) from 95.804%
when pulling 8be3e7d on adamchainz:login_not_required
into 03debcf on pennersr:main.

[pennersr]

I am not sure if a test is required but I also haven't loaded this into a project to check.

Without having tests in place it would be too easy to introduce regression once this feature is merged. But also now, there is no assurance that this is complete. For example, I would have expected allauth.mfa and allauth.headless to be impacted as well.

This cannot really be covered by a few tests. You actually need to run the whole test suite with a project that uses the LoginRequiredMiddleware. Therefore, we need to introduce a tests.login_required_middleware project and run all tests for that project as part of the pipelines.

[pennersr]

There is not much point on keeping this PR open as it is far from complete. Feel free to file a PR once the work is sufficiently complete.

[pennersr]

I've taken a first stab at what I mentioned above here:

https://codeberg.org/allauth/django-allauth/pulls/4104