feat: refactor migration job to use preSQL and postSQL from TargetTable; update config structure for job definitions

cmd/go_migrate/process.go

@@ -82,10 +82,10 @@ func processMigrationJob(
 		return result
 	}
 
-	preSqlQueries := job.PreSQL
+	preSqlQueries := job.TargetTable.PreSQL
 	if job.TruncateTarget {
 		truncateQuery := buildTruncateQuery(targetDbType, job.TargetTable.Schema, job.TargetTable.Table, job.TruncateMethod)
-		preSqlQueries = append([]string{truncateQuery}, job.PreSQL...)
+		preSqlQueries = append([]string{truncateQuery}, job.TargetTable.PreSQL...)
 	}
 
 	for _, query := range preSqlQueries {
@@ -238,7 +238,7 @@ func processMigrationJob(
 		cancel()
 	}()
 
-	for _, query := range job.PostSQL {
+	for _, query := range job.TargetTable.PostSQL {
 		if _, err := targetDbWrapper.Exec(localCtx, query); err != nil {
 			result.Error = err
 			return result