Implement FilterBackend to filter committee data

[exalate-issue-sync]

Create a drf filter backend (https://www.django-rest-framework.org/api-guide/filtering/#:~:text=request%20or%20user.-,Example,-For%20example%2C%20you ) that behaves like get_queryset in CommitteeOwnedViewMixin. Either change CommitteeOwnedViewMixin to use the filter backend or add filter backend to DjangoFilterBackend and remove the mixin if it serves no other purpose

QA Notes

Unit tests to be provided

DEV Notes

Note: if we go with the latter option (add filter backend to [DjangoFilterBackend|https://www.django-rest-framework.org/api-guide/filtering/#djangofilterbackend] and remove the mixin), we will need to set filter_backends to None/empty as follows on all relevant view sets:

{{filter_backends =}} None or () ?

Design

null

See full ticket and images here: FECFILE-1890