Restore error handling in CopilotCLI LocalSessionManager initialization

[Copilot]

A prior commit stripped the try-catch block and TelemetryService type alias from LocalSessionManager initialization, silently swallowing errors that previously surfaced in logs.

Changes

• Restored TelemetryService type alias — ConstructorParameters<typeof internal.LocalSessionManager>[0]['telemetryService'] used for safe typed cast
• Restored try-catch with error logging — failures during LocalSessionManager init are now logged before rethrowing

type TelemetryService = ConstructorParameters<typeof internal.LocalSessionManager>[0]['telemetryService'];

// In constructor:
this._sessionManager = new Lazy<Promise<internal.LocalSessionManager>>(async () => {
    const { internal } = await this.copilotCLISDK.getPackage();
    try {
        const telemetryService = new internal.NoopTelemetryService() as unknown as TelemetryService;
        return new internal.LocalSessionManager({ telemetryService, flushDebounceMs: undefined, settings: undefined, version: undefined });
    } catch (error) {
        this.logService.error(`Failed to initialize Copilot CLI Session Manager: ${error}`);
        throw error;
    }
});

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