Make drop labels function outside of loadFeatureFilesFromImageTypes

[katy-scott]

Move this code to an independent function:

readii/src/readii/io/loaders/features.py

Lines 68 to 76 in 36bf8e3

	try:
	# Drop the labels from the dataframe if specified
	if drop_labels:
	# Data is now only extracted features
	raw_feature_data.drop(labels_to_drop, axis=1, inplace=True)
	except KeyError as e:
	logger.warning(f"{feature_file_path} does not have the labels {labels_to_drop} to drop.")
	# Skip to the next image type
	continue