Reland "Allow injecting media channel into VideoRtpReceiver"

This is a reland of commit f0edfc399074da2c0b6a3fe866462fa464addf5c

Will wait with submitting once we've figured out the bot situation.

Original change's description:
> Allow injecting media channel into VideoRtpReceiver
>
> This aligns VideoRtpReceiver and AudioRtpReceiver by allowing the
> media channel to be passed directly during construction. This
> dependency injection is necessary preparation for creating senders
> and receivers from within the RtpTransceiver class.
>
> Also create parity between the audio and video receiver
> constructors by removing the explicit `is_unified_plan` boolean from
> `AudioRtpReceiver`.
>
> Key changes:
> * Update `VideoRtpReceiver` to accept an optional
>   VideoMediaReceiveChannelInterface` in the constructor.
> * Refactor `AudioRtpReceiver` constructors to not have the
>   `is_unified_plan` argument in constructors that are only used with
>   unified plan. Leave one dedicated constructor for planb.
> * Update call sites in `RtpTransmissionManager` and unit tests.
>
> Bug: webrtc:42222804
> Change-Id: Ifa82f5ac4087b048f5e6d78284a4e79678c8e3b6
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/433841
> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#46499}

Bug: webrtc:42222804
Change-Id: I90a85934911e31a7a2495e51146bf153d4bd6aa4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/434589
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46511}