refactor(editor): playground doc collection typing migration (#9593)

blocksuite/playground/apps/starter/data/utils.ts

@@ -1,7 +1,7 @@
-import type { DocCollection } from '@blocksuite/store';
+import type { Workspace } from '@blocksuite/store';
 
 export interface InitFn {
-  (collection: DocCollection, docId: string): Promise<void> | void;
+  (collection: Workspace, docId: string): Promise<void> | void;
   id: string;
   displayName: string;
   description: string;