nes: next-cursor: enforce max_tokens of 4 tokens (#2489)

* nes: next-cursor: refactor: extract a separate object

* nes: next-cursor: enforce max_tokens of 4 tokens

Author: ulugbekna

src/extension/xtab/node/xtabNextCursorPredictor.ts

@@ -8,6 +8,7 @@ import { ChatFetchResponseType, ChatLocation } from '../../../platform/chat/comm
 import { ConfigKey, IConfigurationService } from '../../../platform/configuration/common/configurationService';
 import { ChatEndpoint } from '../../../platform/endpoint/node/chatEndpoint';
 import { NextCursorLinePrediction } from '../../../platform/inlineEdits/common/dataTypes/nextCursorLinePrediction';
+import { OptionalChatRequestParams } from '../../../platform/networking/common/fetch';
 import { IExperimentationService } from '../../../platform/telemetry/common/nullExperimentationService';
 import { fromUnknown } from '../../../util/common/errors';
 import { Result } from '../../../util/common/result';
@@ -148,15 +149,18 @@ export class XtabNextCursorPredictor {
 			},
 		});
 
+		const requestOptions = {
+			max_tokens: 4,
+			secretKey,
+		} satisfies OptionalChatRequestParams;
+
 		const response = await endpoint.makeChatRequest2(
 			{
 				messages,
 				debugName: 'nes.nextCursorPosition',
 				finishedCb: undefined,
 				location: ChatLocation.Other,
-				requestOptions: secretKey ? {
-					secretKey,
-				} : undefined,
+				requestOptions,
 			},
 			CancellationToken.None,
 		);