Reland "Add ability to state whether the APM output will be used"

This is a reland of 8be2f201ba8790501f6f3fa39f00017f02fca46d

Original change's description:
> Add ability to state whether the APM output will be used
> 
> This CL adds the ability for the surrounding code to state that the
> APM output will not be used. The intended usecase for this is to allow
> APM to run at a lower complexity when the endpoint is muted.
> When APM has been informed that the output will not be used, it can
> turn off code that is needed only for ensuring that the output audio
> will sound good.
> 
> Bug: b/154437967,b/163802450
> Change-Id: I8e22989e35354372e96191d15da44beb9d1b26ae
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/181200
> Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
> Commit-Queue: Per Åhgren <peah@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#31949}

Bug: b/154437967
Bug: b/163802450
Change-Id: Ia77a9e43f913929d1afa72212f1ea6c192d0e519
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/181887
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31957}

modules/audio_processing/test/runtime_setting_util.cc

@@ -41,6 +41,10 @@ void ReplayRuntimeSetting(AudioProcessing* apm,
         AudioProcessing::RuntimeSetting::CreatePlayoutAudioDeviceChange(
             {setting.playout_audio_device_change().id(),
              setting.playout_audio_device_change().max_volume()}));
+  } else if (setting.has_capture_output_used()) {
+    apm->SetRuntimeSetting(
+        AudioProcessing::RuntimeSetting::CreateCaptureOutputUsedSetting(
+            setting.capture_output_used()));
   }
 }
 }  // namespace webrtc