Ensure OnNetworkStateEstimate behaves the same way as internal networks state updates.
Also, ignore OnNetworkStateEstimate if an internal estimator exist.
Bug: webrtc:10742
Change-Id: I7967d202381250c406824fb2d0574bb95d2cd592
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/354102
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Diep Bui <diepbp@google.com>
Cr-Commit-Position: refs/heads/main@{#42456}