Remove reload_kedro_mlflow line magic

[Galileo-Galilei]

Description

The reload_kedro_mlflow line magic is used to expose a mlflow_client in jupyter notebooks automatically.

Context

• To my knowledge, this is not used by anyone. People are likely not aware that it exists. Please comment if you do.
• Whatever I do, kedro will remove this entrypoint in 0.18.3, so it will stop working.

To avoid code debt, this will be removed in future versions, and will not be considered a breaking change.

Possible Implementation

Remove:

• the entire extras folder
• the setup.py entrypoint
  and all according tests

[Galileo-Galilei]

Note for anyone who wants to access the mlflow client in a notebook: loading the kedro extension will automatically creates a context, which setups mlflow. The _mlflow_client is a private attribute you can access directly:

%load_ext kedro.ipython
context.mlflow.server._mlflow_client