Fix or silence redefined-builtin pylint warnings

src/api/serializers.py

src/api/views/__init__.py

src/api/views/badges.py

src/api/views/conferencemember.py

src/api/views/maps.py

src/api/views/schedule.py

src/api/views/users.py

src/api/views/workadventure.py

src/backoffice/views/moderation/board_entry.py

src/backoffice/views/moderation/projects.py

src/core/models/conference.py

src/plainui/utils.py

src/plainui/views/utils.py