feat(config): add isModelAvailabilityServiceEnabled setting (#13777)

packages/core/src/config/config.ts

@@ -305,6 +305,7 @@ export interface ConfigParameters {
     [K in HookEventName]?: HookDefinition[];
   };
   previewFeatures?: boolean;
+  enableModelAvailabilityService?: boolean;
 }
 
 export class Config {
@@ -420,6 +421,7 @@ export class Config {
 
   private previewModelFallbackMode = false;
   private previewModelBypassMode = false;
+  private readonly enableModelAvailabilityService: boolean;
 
   constructor(params: ConfigParameters) {
     this.sessionId = params.sessionId;
@@ -477,6 +479,8 @@ export class Config {
     this.fileDiscoveryService = params.fileDiscoveryService ?? null;
     this.bugCommand = params.bugCommand;
     this.model = params.model;
+    this.enableModelAvailabilityService =
+      params.enableModelAvailabilityService ?? false;
     this.previewFeatures = params.previewFeatures ?? undefined;
     this.maxSessionTurns = params.maxSessionTurns ?? -1;
     this.experimentalZedIntegration =
@@ -1140,6 +1144,10 @@ export class Config {
     return this.enableExtensionReloading;
   }
 
+  isModelAvailabilityServiceEnabled(): boolean {
+    return this.enableModelAvailabilityService;
+  }
+
   getNoBrowser(): boolean {
     return this.noBrowser;
   }