fix: resolve TypeScript build error with @types/node

Add @types/node dependency and eslint disable for require() usage to fix TypeScript compilation.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: nirga

packages/instrumentation-langchain/package.json

@@ -57,6 +57,7 @@
     "@pollyjs/persister-fs": "^6.0.6",
     "@traceloop/instrumentation-bedrock": "workspace:*",
     "@types/mocha": "^10.0.10",
+    "@types/node": "^24.0.15",
     "langchain": "^0.3.30",
     "mocha": "^11.7.1",
     "ts-mocha": "^11.1.0"