Refactor: remove test_ prefix from fixtures

tests/app/conftest.py

tests/app/test_dcat.py

tests/app/test_h5grove.py

tests/app/test_optimade.py

tests/app/v1/routers/common.py

tests/app/v1/routers/test_auth.py

tests/app/v1/routers/test_datasets.py

tests/app/v1/routers/test_entries.py

tests/app/v1/routers/test_entries_edit.py

tests/app/v1/routers/test_graph.py

tests/app/v1/routers/test_groups.py

tests/app/v1/routers/test_materials.py

tests/app/v1/routers/test_metainfo.py

tests/app/v1/routers/test_suggestions.py

tests/app/v1/routers/test_systems.py

tests/app/v1/routers/test_users.py

tests/app/v1/routers/uploads/test_basic_uploads.py

tests/app/v1/routers/uploads/test_group_uploads.py

tests/archive/test_archive.py

tests/conftest.py