Remove BWE logging functionality

BWE logging has as far as I know know been used for a long time. RTC event logs are the prefered method of logging.
Removed since it causes some BUILD pain.

For debugging  the metrics API https://source.chromium.org/chromium/chromium/src/+/main:third_party/webrtc/api/test/metrics/ can be used instead.

Bug: webrtc:343347276
Change-Id: I046b58d880faabfadbc22269b0392fdd644155fc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/352602
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Auto-Submit: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Jeremy Leconte <jleconte@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42402}