fix to be more precise about removing custom event handlers so that w… (#580)

* fix to be more precise about removing custom event handlers so that when we stop a gather we dont also inadvertently stop a background transcribe as well

* test fixes

* fix: endpointing=false was being ignored for Deepgram

lib/tasks/stt-task.js

@@ -14,17 +14,15 @@ class SttTask extends Task {
     const {
       setChannelVarsForStt,
       normalizeTranscription,
-      removeSpeechListeners,
       setSpeechCredentialsAtRuntime,
       compileSonioxTranscripts,
       consolidateTranscripts
     } = require('../utils/transcription-utils')(logger);
     this.setChannelVarsForStt = setChannelVarsForStt;
     this.normalizeTranscription = normalizeTranscription;
-    this.removeSpeechListeners = removeSpeechListeners;
     this.compileSonioxTranscripts = compileSonioxTranscripts;
     this.consolidateTranscripts = consolidateTranscripts;
-
+    this.eventHandlers = [];
     this.isHandledByPrimaryProvider = true;
     if (this.data.recognizer) {
       const recognizer = this.data.recognizer;
@@ -140,6 +138,15 @@ class SttTask extends Task {
     }
   }
 
+  addCustomEventListener(ep, event, handler) {
+    this.eventHandlers.push({ep, event, handler});
+    ep.addCustomEventListener(event, handler);
+  }
+
+  removeCustomEventListeners() {
+    this.eventHandlers.forEach((h) => h.ep.removeCustomEventListener(h.event, h.handler));
+  }
+
   async _initSpeechCredentials(cs, vendor, label) {
     const {getNuanceAccessToken, getIbmAccessToken} = cs.srf.locals.dbHelpers;
     let credentials = cs.getSpeechCredentials(vendor, 'stt', label);