Ensure probing is not instantiated again until after timeout if a probe has been sent to max rate.
Bug: webrtc:42224658
Change-Id: I7d0d2edcfa81b1b454ea5748962af5a2070b347c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/363240
Reviewed-by: Diep Bui <diepbp@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43068}