Remove django-allauth-2fa, dj-rest-auth and django-user-sessions

[matmair]

This PR remove django-allauth-2fa and replaces it with the inline functions of django-allauth. This reduces the dependency footprint and eliminates a bunch of custom creations.

Update: Most of the planned things we would be interested in are now implemented and the scope shifted a bit - it makes sense to just ripp all auth extensions out and use only allauths built-in things. We have a lot of grown auth-adjacent code that can probably be removed/rewritten.

Related Issues

• Closes Remove django-allauth-2fa #6281
• Closes [UI] Multifactor token configuration #8708
• Closes New Interface - Unable to Login with Google SSO #8949

TODO

• refactor authentication forms && detection of enabled features (see 8912)
• implement custom link target lookup for email from django-allauth
• show user ID in MFA flow
• implement email verification flow
• re-implement registration flow
• re-implement password reset flow
• re-implement password change
• keep auth context somewhere for the local session to refer back to
• move now removed system status info into main status (registration, mfa, sso available)
• switch back to browser flow for auth APIs
• rename all new auth URLs to fix to the current schema
• include schema for auth with central API
• write changelog

Coverage

This relies on several upstream PRs:

• https://codeberg.org/allauth/django-allauth/pulls/4236 (custom frontend URLs)
• https://codeberg.org/allauth/django-allauth/pulls/4235 (allowing email registration even if MFA is enabled)

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[matmair]

This is done as far as possible right now; I am waiting on upstream to merge a few PRs so that this can get merged.
I would appreciate reviews, this should work in dev mode with the API being available on http://localhost:8000 (a PR to upstream needs to be merged to fix that limitation)

[matmair]

Upstream has merged what we need; this can be released after 0.65.4 is released;
before this is merged 00bb6c5 needs to be reverted

[SchrodingersGat]

Upstream has merged what we need; this can be released after 0.65.4 is released;

Do you mean upstream for django-allauth?

[matmair]

@SchrodingersGat yes

[SchrodingersGat]

@matmair I indend to get to this soon to review and test