task: #3092115 Skip validation of unmapped fields

Ben Stallingsrequested to merge
issue/feeds-3092115:3092115-skip-validation-of into 8.x-3.x

Adds a "Skip validation of unmapped fields" processor option that filters out validation violations on configurable fields that are not mapped to, while still validating mapped fields and base fields (e.g. title) to avoid unclear database errors on required base fields.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

Closes #3092115

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