Revert "Detect codec collisions between audio and video sections"

This reverts commit a8aae89f379e36cd418bf4ef194115d2ca231a1c.

Reason for revert: The test is failing on downstream bots:

pc/test/integration_test_helpers.h:900
Value of: SetRemoteDescription(std::move(desc))
  Actual: false
Expected: true

Original change's description:
> Detect codec collisions between audio and video sections
>
> This bug was reproduced as a side effect of fixing
> issues.chromium.org/395077842
>
> Bug: webrtc:42224689
> Change-Id: I41c2bb02a6ec9fb9e9c057d64255dd7896da4f4d
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/377460
> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> Auto-Submit: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#47664}

Bug: webrtc:42224689
Change-Id: Iefc1872c330a03ea2b6e9ef12aee1fcdfeceba9e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/471260
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47670}