fix: modelcontextprotocol#780 onerror and other listener not remove after client close (stdio)

Author: shellRaining

packages/client/test/client/cross-spawn.test.ts

@@ -2,7 +2,8 @@ import type { ChildProcess } from 'node:child_process';
 
 import type { JSONRPCMessage } from '@modelcontextprotocol/core';
 import spawn from 'cross-spawn';
-import type { Mock, MockedFunction } from 'vitest';
+import type { Mock, MockedFunction} from 'vitest';
+import { vi } from 'vitest';
 
 import { getDefaultEnvironment, StdioClientTransport } from '../../src/client/stdio.js';