[DT-2750] Erase old study properties before applying new registration to a study. #2770
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Addresses
https://broadworkbench.atlassian.net/browse/DT-2750
Summary
Removes all study properties when receiving a new registration for a study. This allows patching to work for a particular study property through the new patch endpoint, but cleans up old study properties that may no longer be relevant when submitting a new registration and applying it to an existing study.
Have you read CONTRIBUTING.md lately? If not, do that first.