Revert "Fix payload type allocation issues for Audio RED and MID recycling."

This reverts commit 9e3381393a233cac896085fc3f26bdac83caaaef.

Reason for revert: Breaks webrtc-importer

Original change's description:
> Fix payload type allocation issues for Audio RED and MID recycling.
>
> This CL addresses several issues identified while enabling the
> WebRTC-PayloadTypesInTransport field trial:
> - Enforce media type equality in codec matching to prevent Audio/Video
> RED collisions.
> - Relax RED matching rules to allow negotiation with unlinked RED codecs.
> - Validate media type during MID recycling in CodecVendor to prevent
> incorrect codec merging.
> - Update documentation with the video implementation strategy.
>
> Bug: webrtc:360058654
> Change-Id: I1ecbdad2179d346b3682875d823889aa076e353e
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/453001
> Reviewed-by: Henrik Boström <hbos@webrtc.org>
> Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#47113}

Bug: webrtc:360058654
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I5f7c642e936c1b06781b78f10293837d1262d450
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/455820
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47115}