refactor: move utils and cleanup test helpers (#10261)

blocksuite/playground/apps/env.d.ts

@@ -1,5 +1,4 @@
 import type { EditorHost } from '@blocksuite/block-std';
-import type { TestUtils } from '@blocksuite/blocks';
 import type { AffineEditorContainer } from '@blocksuite/presets';
 import type { BlockSchema, Blocks, Workspace, Transformer } from '@blocksuite/store';
 import type { z } from 'zod';
@@ -20,7 +19,6 @@ declare global {
     job: Transformer;
     Y: typeof Y;
     std: typeof std;
-    testUtils: TestUtils;
     host: EditorHost;
     testWorker: Worker;
 

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

@@ -1,4 +1,4 @@
-import { AffineSchemas, SpecProvider, TestUtils } from '@blocksuite/blocks';
+import { AffineSchemas, SpecProvider } from '@blocksuite/blocks';
 import { nanoid, Schema, Transformer } from '@blocksuite/store';
 import {
   createAutoIncrementIdGenerator,
@@ -73,7 +73,6 @@ export function createStarterDocCollection() {
     },
   });
   window.Y = Y;
-  window.testUtils = new TestUtils();
 
   return collection;
 }