bug: numpy ndarray has no attribute 'remove' error from label.py

[katy-scott]

When no event value mapping passed for RADCURE processing, get the following error:

File "/home/bhkuser/bhklab/katy/readii_2_roqc/.pixi/envs/default/lib/python3.13/site-packages/readii/process/label.py", line 248, in eventOutcomeColumnSetup
    event_column_value_mapping = survivalStatusToNumericMapping(event_outcome_column=dataframe_with_standardized_outcome[outcome_column_label])
File "/home/bhkuser/bhklab/katy/readii_2_roqc/.pixi/envs/default/lib/python3.13/site-packages/readii/process/label.py", line 172, in survivalStatusToNumericMapping
    existing_event_values.remove("alive")
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'numpy.ndarray' object has no attribute 'remove'