Inconsistant date pattern between breedbase and brapi call

[chris263]

Expected Behavior

Field Book crashes when loading trials with accessions that have the 'acquisition date' formatted as YYYYMMDD rather than YYYY-MM-DD.

@bellerbrock For example the editable stockprop definitions used in the accession upload in breedbase says to use format YYYYMMDD, but the tests use format YYYY-MM-DD

For Bugs:

Environment

Steps to Reproduce