fix(MCP Client Tool Node): Use proxy for MCP calls #21720
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Summary
This PR enables proxy support for MCP Client Tool. It updates fetch method in MCPClient constructor with a custom fetch that uses ProxyAgent
Testing
Related Linear tickets, Github issues, and Community forum posts
https://linear.app/n8n/issue/NODE-3754/mcp-client-tool-proxy-support
Review / Merge checklist
release/backport(if the PR is an urgent fix that needs to be backported)