[DUOS-2806] Fix empty columns for new study datasets

[fboulnois]

Addresses

https://broadworkbench.atlassian.net/browse/DUOS-2806

Summary

Fix empty columns for new study datasets by trying all available depositor and custodian fields.

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[rushtong]

Nice! 👍🏽

[rushtong]

👍🏽

[rushtong]

New tests look good 👍🏽