Unitstore: Fix the Folder migration (#96078)

* UniStore: Add folder to the SQL backend

This reverts commit aaa4f4a23e.

* fix folder migration

pkg/storage/unified/sql/testdata/mysql--resource_insert-simple.sql

@@ -5,6 +5,7 @@ INSERT INTO `resource`
         `resource`,
         `namespace`,
         `name`,
+        `folder`,
         `previous_resource_version`,
         `value`,
         `action`
@@ -15,6 +16,7 @@ INSERT INTO `resource`
         'rr',
         'nn',
         'name',
+        'fldr',
         123,
         '[]',
         'ADDED'