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 -->

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