refactor: rename Batch to Partition in error handling and processing functions for consistency

internal/app/models/main.go

@@ -7,7 +7,7 @@ type UnknownRowValues = []any
 type Batch struct {
 	Id           uuid.UUID
 	PartitionId  uuid.UUID
-	Data         []UnknownRowValues
+	Rows         []UnknownRowValues
 	RetryCounter int
 }