[mcp] Move to /tools (facebook#33083)

Moves to a tools directory.
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33083).
* facebook#33085
* facebook#33084
* __->__ facebook#33083

Author: poteto

compiler/packages/react-mcp-server/src/index.ts

@@ -20,7 +20,7 @@ import * as cheerio from 'cheerio';
 import {queryAlgolia} from './utils/algolia';
 import assertExhaustive from './utils/assertExhaustive';
 import {convert} from 'html-to-text';
-import {measurePerformance} from './utils/runtimePerf';
+import {measurePerformance} from './tools/runtimePerf';
 
 const server = new McpServer({
   name: 'React',