PATCH: Utils mcp.ts clean up

[alexortiz201]

There are duplicates of the overload signature in mcp.ts

function sendMcpMessage<Options extends MessageOptions>(
	type: 'link',
	payload: McpMessageTypes['link'],
	options?: Options,
): McpMessageReturnType<Options>

Cleaned this up so the diff tool no longer flags a missing dupe signature. Had to do this for the rest of the downstream exercises' copied files.

[kentcdodds]

Good catch! Thanks!