Mark room as fully read when user goes back to the room list. (#2687)

* Remove not helping warning.

* Add and improve tests

* Send the `m.fully_read` read marker when the user navigates back to the room list, to mark the room as read.

libraries/voicerecorder/impl/src/main/kotlin/io/element/android/libraries/voicerecorder/impl/audio/DefaultEncoder.kt

@@ -48,7 +48,6 @@ class DefaultEncoder @Inject constructor(
 
     override fun release() {
         encoder?.release()
-            ?: Timber.w("Can't release encoder that is not initialized")
         encoder = null
     }
 }