MODPATRON-156 Validation errors should return 422 #142
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Purpose
When mod-patron fails to create a request because circulation rules don't allow it, it returns 500 error code with plain text body (screenshot in the attachment). On production, 500 errors' messages get replaced with a standard message which hides this information from the user.
When validation errors happen, mod-patron should return 422 code with JSON body, formatted in the same way as other errors in FOLIO (errors.schema)
Resolves: MODPATRON-156