remove unneeded mock and pytest-mock dependencies

requirements_dev.in

requirements_dev.txt

tests/unit/app_conf_test.py

tests/unit/bulk_persistence/dask_data_ipc_test.py

tests/unit/clients/client_factory_test.py

tests/unit/conftest.py

tests/unit/errors/error_handler_test.py

tests/unit/fixtures.py

tests/unit/fixtures_test.py

tests/unit/middleware/traces_middleware_test.py

tests/unit/modules/log_recognition/log_recognition_test.py

tests/unit/persistence/dask_blob_storage_test.py

tests/unit/routers/chunking_test.py

tests/unit/routers/ddms_v2/common_ddms_v2_test.py

tests/unit/routers/ddms_v2/log_ddms_v2_private_test.py

tests/unit/routers/ddms_v3/common_ddms_v3_test.py

tests/unit/routers/ddms_v3/delete_ddms_v3_test.py

tests/unit/routers/ddms_v3/search_v3_test.py

tests/unit/routers/delete_recursive_test.py

tests/unit/routers/dipset/dip_ddms_v2.py