chore(server): ignore never applied rolled back error (#12703)

closes #12701

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **Bug Fixes**
  - Improved error handling during migration rollbacks to prevent unnecessary errors when migrations were never applied.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/scripts/self-host-predeploy.js

@@ -64,6 +64,9 @@ function fixFailedMigrations() {
       if (
         err.message.includes(
           'cannot be rolled back because it is not in a failed state'
+        ) ||
+        err.message.includes(
+          'cannot be rolled back because it was never applied'
         )
       ) {
         // migration has been rolled back, skip it