This proved to be not very efficient unfortunately, so revert it and
keep bundling FORWARD-TSN with other packets to be more efficient.
https://github.com/sctplab/usrsctp/issues/597 is still unresolved.
Note that this is not a clean revert; The logic to rate limit the
sending of FORWARD-TSN is kept, as it still makes sense.
This partly reverts commit 0ca62e3752149ad37f73bf074db0a5f8fcaf6585.
Bug: webrtc:12961
Change-Id: I42728434290e7ece19e9c23f24ef6f3d3b171315
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/259520
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36584}
ddc2f334c4