fix: use model to get attachment columns

packages/nocodb/src/modules/jobs/migration-jobs/nc_job_001_attachment.ts

@@ -202,17 +202,6 @@ export class AttachmentMigrationProcessor {
             base_id,
           };
 
-          const attachmentColumns = await ncMeta
-            .knexConnection(MetaTable.COLUMNS)
-            .select('id', 'title', 'column_name')
-            .where('uidt', UITypes.Attachment)
-            .where('fk_model_id', fk_model_id);
-
-          if (!attachmentColumns?.length) {
-            this.log(`no attachment columns found for ${fk_model_id}`);
-            continue;
-          }
-
           const source = await Source.get(context, source_id);
 
           if (!source) {
@@ -229,6 +218,10 @@ export class AttachmentMigrationProcessor {
 
           await model.getColumns(context);
 
+          const attachmentColumns = model.columns.filter(
+            (c) => c.uidt === UITypes.Attachment,
+          );
+
           const dbDriver = await NcConnectionMgrv2.get(source);
 
           if (!dbDriver) {