Remove redundant fixture elastic

tests/app/test_optimade.py

tests/app/v1/routers/test_datasets.py

tests/app/v1/routers/test_entries_edit.py

tests/app/v1/routers/test_info.py

tests/conftest.py

tests/examples/test_archive_query.py

tests/metainfo/test_elasticsearch_extension.py

tests/test_cli.py

tests/test_search.py