Update incoming call notification content to "📹 Incoming call"

features/call/api/src/main/kotlin/io/element/android/features/call/api/ElementCallEntryPoint.kt

@@ -30,6 +30,7 @@ interface ElementCallEntryPoint {
      * @param avatarUrl The avatar url of the room or DM.
      * @param timestamp The timestamp of the event that started the call.
      * @param notificationChannelId The id of the notification channel to use for the call notification.
+     * @param textContent The text content of the notification. If null the default content from the system will be used.
      */
     fun handleIncomingCall(
         callType: CallType.RoomCall,
@@ -40,5 +41,6 @@ interface ElementCallEntryPoint {
         avatarUrl: String?,
         timestamp: Long,
         notificationChannelId: String,
+        textContent: String?,
     )
 }