add retrieve_cost_data, remove depreciated function, clean workflow

[virio-andreyana]

Here are the proposed changes following the code testing on March 17, 2025. Since most of the environment versions are not locked, several deprecated functions were encountered, but they remain manageable.

• override_component_attrs() are no longer necessary no more override_component_attrs for multilinks pypsa-eur#695
• HTTP = HTTPRemoteProvider() no longer work, use the standard PyPSA-Eur retrieve_cost_data.py instead
• Replace sum(dims=[]) to sum(dim=[])
• Replace n.mremove to n.remove
• Adjust n.statistics groupby=["bus", "carrier"]

Hope this helps!