fix: potential race condition on app load when migration (#2977)

Co-authored-by: Alex Yang <himself65@outlook.com>

packages/workspace/src/atom.ts

@@ -118,7 +118,10 @@ const rootWorkspacesMetadataPromiseAtom = atom<
       }
 
       // migration step, only data in `METADATA_STORAGE_KEY` will be migrated
-      if (metadata.some(meta => !('version' in meta))) {
+      if (
+        metadata.some(meta => !('version' in meta)) &&
+        !globalThis.$migrationDone
+      ) {
         await new Promise<void>((resolve, reject) => {
           signal.addEventListener('abort', () => reject(), { once: true });
           window.addEventListener('migration-done', () => resolve(), {