Fixed some minor bugs in eval_mteb.py

#21
  1. task_cls has no field description, change it to metadata_dict
  2. Misspelling for mteb-fr, tas_names -> task_names
  3. No assignment of the task_names variable for mteb-pl
  4. Removed unused imports
  5. Used ruff for code formatting
Ready to merge
This branch is ready to get merged automatically.

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