Save the valid track flag in a separate group in the preprocessed files
The following discussion from !559 (merged) should be addressed:
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@svanstro started a discussion: (+1 comment) Also I was thinking that we could clean some of the masking stuff up by writing the valid track flag as a separate group at each stage of the preprocessing. Including it in the final training files as a separate group would greatly improve the ease of identifying the masked tracks in the final train files