feat(da): remove availability checks from retriever (#835)

block/retriever.go

@@ -135,17 +135,7 @@ func (m *Manager) fetchBatch(daMetaData *da.DASubmitMetaData) da.ResultRetrieveB
 			},
 		}
 	}
-	// Check batch availability
-	availabilityRes := m.Retriever.CheckBatchAvailability(daMetaData)
-	if availabilityRes.Code != da.StatusSuccess {
-		return da.ResultRetrieveBatch{
-			BaseResult: da.BaseResult{
-				Code:    da.StatusError,
-				Message: fmt.Sprintf("Error fetching batch: %s", availabilityRes.Message),
-				Error:   availabilityRes.Error,
-			},
-		}
-	}
+
 	// batchRes.MetaData includes proofs necessary to open disputes with the Hub
 	batchRes := m.Retriever.RetrieveBatches(daMetaData)
 	// TODO(srene) : for invalid transactions there is no specific error code since it will need to be validated somewhere else for fraud proving.