don't retry operations that have conflict error

If an operation receives a conflict error from the blockchain connector,
currently it will continutally retry submitting that operation but it will
never succeed. Instead, we shouldn't retry if we know the connector has
received the submission.

internal/batch/batch_processor.go

@@ -633,6 +633,11 @@ func (bp *batchProcessor) dispatchBatch(payload *DispatchPayload) error {
 						}
 					}
 				}
+				conflictErr, conflictTestOk := err.(operations.ConflictError)
+				if conflictTestOk && conflictErr.IsConflictError() {
+					// We know that the connector has received our batch, so we shouldn't need to retry
+					return true, nil
+				}
 			} else {
 				if core.IsPinned(payload.Batch.TX.Type) {
 					payload.addMessageUpdate(payload.Messages, core.MessageStateReady, core.MessageStateSent)