[backend] Pre-commit cleanup

beat/backend/python/algorithm.py

beat/backend/python/baseformat.py

beat/backend/python/database.py

beat/backend/python/dataformat.py

beat/backend/python/execution/algorithm.py

beat/backend/python/execution/database.py

beat/backend/python/execution/loop.py

beat/backend/python/execution/messagehandlers.py

beat/backend/python/helpers.py

beat/backend/python/inputs.py

beat/backend/python/library.py

beat/backend/python/outputs.py

beat/backend/python/protocoltemplate.py

beat/backend/python/scripts/databases_provider.py

beat/backend/python/scripts/describe.py

beat/backend/python/scripts/execute.py

beat/backend/python/scripts/index.py

beat/backend/python/scripts/loop_execute.py

beat/backend/python/test/test_data_loaders.py

beat/backend/python/test/test_database.py