enhance(macros/AvailableInWorkers): add "only available in Web Workers" case (#10968)

Author: skyclouds2001

Diff for: kumascript/macros/AvailableInWorkers.ejs

@@ -9,8 +9,9 @@
 //      'window_and_worker_except_service': all workers but ServiceWorker (and in Window)
 //      'worker_except_service': all workers but ServiceWorker (and no window)
 //      'window_and_service': only in ServiceWorker (and in Window)
-//      'service':  only in ServiceWorker
-//      null: (default) All workers (and Window)
+//      'service': only in ServiceWorker
+//      'worker': All workers (and no Window)
+//      null: (default) All workers (and in Window)
 //
 //  {{AvailableInWorkers}}
 //  {{AvailableInWorkers("worker_except_service")}}
@@ -40,6 +41,11 @@ const textDefault = mdn.localString({
   "ru": `Эта возможность доступна в <a href="/${locale}/docs/Web/API/Web_Workers_API">Web Workers</a>.`,
 });
 
+const textWorker = mdn.localString({
+  "en-US": `This feature is only available in <a href="/${locale}/docs/Web/API/Web_Workers_API">Web Workers</a>.`,
+  "zh-CN": `此特性仅在 <a href="/${locale}/docs/Web/API/Web_Workers_API">Web Worker</a> 中可用。`,
+});
+
 const textNotService = mdn.localString({
   "en-US": `This feature is available in <a href="/${locale}/docs/Web/API/Web_Workers_API">Web Workers</a>, except for <a href="/${locale}/docs/Web/API/Service_Worker_API">Service Workers</a>.`,
   "zh-CN": `此特性在 <a href="/${locale}/docs/Web/API/Web_Workers_API">Web Worker</a>（不包括 <a href="/${locale}/docs/Web/API/Service_Worker_API">Service Worker</a>）中可用。`,
@@ -75,6 +81,7 @@ const workerType = $0 || 'default';
 
 const associatedText = {
   default: () => textDefault,
+  worker: () => textWorker,
   window_and_worker_except_service: () => textNotService,
   worker_except_service: () => textNotServiceNotWindow,
   window_and_dedicated: () => textDedicated,