Rename (packets|bytes)_dropped to (packets|bytes)_discarded_no_receiver
in PC level framework based tests to make it more clear for metric means.
Bug: None
Change-Id: I8d36f5d03399ad40cd367bb65410ff97a0616d4e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/212611
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33513}