TypeScript SDK: Use generated types for model info and remove duplicates

[sergiou87]

Replace local duplicate model info types (which need to be manually updated) with types from generated files.

I tried this approach since I see the same pattern used for SessionEvent and RemoteSessionMode:

copilot-sdk/nodejs/src/types.ts

Lines 12 to 21 in afbebc7

	import type {
	ReasoningSummary,
	SessionEvent as GeneratedSessionEvent,
	} from "./generated/session-events.js";
	import type { CopilotSession } from "./session.js";
	import type { RemoteSessionMode } from "./generated/rpc.js";
	import type { OpenCanvasInstance } from "./generated/rpc.js";
	import type { ToolSet } from "./toolSet.js";
	export type { RemoteSessionMode } from "./generated/rpc.js";
	export type SessionEvent = GeneratedSessionEvent;