Closes #19338 - Add in_list and exact support on all id and enum fields in GraphQL v2

[bctiemann]

Closes: #19338

Converts all id fields and all enum-based fields to FilterLookups, which support in_list and exact querying.

• Changes BaseObjectTypeFilterMixin and ChangeLogFilterMixin (which are used by most if not all field types) to define id using a FilterLookup instead of UNSET.
• In all apps' filters.py, all fields defined as a choice of enum values has similarly been redefined using a FilterLookup, with the same new lookup support.

Note: The linter really does not like this kind of typing syntax, but I wasn't able to find a better way to do it:

    authentication_algorithm: (
        FilterLookup[Annotated['AuthenticationAlgorithmEnum', strawberry.lazy('vpn.graphql.enums')]] | None
    ) = (
        strawberry_django.filter_field()
    )

Note: Depends on #20667

[pheus]

Not a maintainer or reviewer - just dropping a quick thought. Thanks for the PR!

From my understanding, FilterLookup is mostly aimed at string fields and exposes string‑specific operators (e.g., contains, icontains, startswith, endswith). If the goal here is to limit the available filters for this field, would BaseFilterLookup be a better fit so we only surface the more generic lookups (like exact, in, isnull) and avoid string‑specific ones that may not apply?

If I’m off base or there’s a use case for the string lookups here, please feel free to ignore. Appreciate the work on this!

[bctiemann]

@pheus You could be right; I only grabbed FilterLookup because it seemed more the recommended route (in more generic use cases than this one). Thanks for the pointer!

[jeremystretch]

Marking this as blocked by #20679 temporarily