feat: handle conflicts and improve test OpenAPI spec validation in MockMVC

Timothy Stonerequested to merge
fix/handle-update-operations into master

Refactor use of OpenApi request and response validation with Atlassian's Swagger validator with the MockMVC library. Remove the Filter implementation. Refactor tests to validate the OAS.

Add support for Conflict exceptions and provide an Spring ExceptionAdvice for handling Conflicts when encountering database integrity violations.

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