feat: add MANZANA migration job and update related processing logic

scripts/mssql-copy-in/puerto.go

@@ -55,12 +55,10 @@ func generatePuertoRows(
 ) {
 	defer close(out)
 
-	rand.Seed(time.Now().UnixNano())
-
 	rowsGenerated := 0
 	currentChunk := make([]UnknownRowValues, 0, chunkSize)
 
-	for i := 0; i < totalRows; i++ {
+	for range totalRows {
 		row := generatePuertoRow()
 		currentChunk = append(currentChunk, row)
 		rowsGenerated++