Add more qualx unit tests

[leewyang]

This PR adds more unit tests for qualx, and includes the following fixes found during testing:

• sort Project fields in hash_util.py to allow for slight re-ordering of fields up to n_fields.
• modify globbing of alignment CSV files to include the "current" file without any prefix.
• add a configurable label_col argument to split_stratified.py.

[amahussein]

Thanks @leewyang !
LGTME
Asking @sayedbilalbari to take a look as well as it can be a good opportunity to align his knowledge of the QualX tests after he worked on #1649

[sayedbilalbari]

Thanks @leewyang. I get a fair idea from the added tests as to what they are targeting. Perhaps a little more verbose comments would be helpful in understanding them better. Eg - test_compute_alignment_from_raw_features, is understandable from a perspective that I see that the alignment df is being verified for certain columns. Perhaps adding a refer -> , would be more helpful
LGTM

[leewyang]

Thanks @sayedbilalbari , will add more detailed comments in followups.