Bulk Import: Upfront Schema Validation

[pozylon]

Currently, when somebody sends a JSON-schema validatable invalid event the event only fails inside the BULK_IMPORT work job. In those cases the sending system assumes that the creation worked because adding the job with API resulted in a non-error response.

In those cases, we should check the structure of the whole payload to allow unchained to reject bulk_import up-front and send the response back to the uploading system.

Examples:

• Invalid JSON
• An operation without a required field like the translation part of an option for a filter
• A product with a non-numeric sequence
• An entity or operation that is not supported by the bulk-importer