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}