sdp munging: detect removal of ice-options

vs modification. This is currently (for reasons that are not clear, this
removal is not affecting the code) one of the biggest contributors. It shows as "trickle ice removed" but what is actually removed is the ice-options line itself.

Bug: webrtc:414284082
Change-Id: If280e0691058291bfb05479f4c8fb6f84d68fbfb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/485280
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Reviewed-by: Guido Urdaneta <guidou@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48133}