Refactored InvokeBatchDuplicateGuardTests to expect and assert
FluentValidation's ValidationException instead of the custom
BadRequestException when a duplicate BatchId is submitted.
Assertions and comments were updated accordingly, and the
DigitalData.Core.Exceptions import was removed. Test logic
remains unchanged.
Replaced Last with LastBatch in ReadResultViewQuery to enable fetching all results from the most recent batch. Updated handler logic and tests accordingly, and added GetLastBatchEntitiesAsync to retrieve entities by latest BatchId.
Added InvokeBatchDuplicateGuardTests to verify that invoking batch rec actions with an existing BatchId throws BadRequestException, while using a new BatchId does not trigger the duplicate guard. Tests use MediatR ISender and real database data for integration coverage. Added necessary using directives.
