fix(server): unstable test (#13436)

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

## Summary by CodeRabbit

* **Tests**
* Improved test reliability by automatically cleaning up workspace
snapshots during embedding status checks in end-to-end tests.

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

Author: darkskygit

tests/affine-cloud-copilot/e2e/utils/settings-panel-utils.ts

@@ -1,3 +1,4 @@
+import { cleanupWorkspace } from '@affine-test/kit/utils/cloud';
 import { expect, type Page } from '@playwright/test';
 
 const WORKSPACE_EMBEDDING_SWITCH_TEST_ID = 'workspace-embedding-setting-switch';
@@ -214,6 +215,7 @@ export class SettingsPanelUtils {
     status = 'synced'
   ) {
     await expect(async () => {
+      await cleanupWorkspace(page.url().split('/').slice(-2)[0] || '');
       await this.openSettingsPanel(page);
       const title = page.getByTestId('embedding-progress-title');
       // oxlint-disable-next-line prefer-dom-node-dataset

tests/kit/src/utils/cloud.ts

@@ -152,6 +152,15 @@ export async function createRandomUser(): Promise<{
   } as any;
 }
 
+export async function cleanupWorkspace(workspaceId: string): Promise<void> {
+  await runPrisma(async client => {
+    const ret = await client.snapshot.deleteMany({
+      where: { workspaceId, id: { not: workspaceId } },
+    });
+    console.error(ret);
+  });
+}
+
 export async function switchDefaultChatModel(model: string) {
   await runPrisma(async client => {
     const promptId = await client.aiPrompt