Revert "Move VideoQualityAnalyzer to OnFrameDropped callback."

This reverts commit a7c29a690e22a2c0edd6f543e580c7f601362061.

Reason for revert: Breaks downstream project.

Original change's description:
> Move VideoQualityAnalyzer to OnFrameDropped callback.
>
> This deprecates usage of the EncodedImageCallback::DropReason type,
> which was never actually read anyway, and moves this code to the new
> callback method.
>
> Bug: webrtc:467444018
> Change-Id: I105e44237e6f1bf02bd5664cc6a098a2e734c6e9
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/449640
> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
> Commit-Queue: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#46913}

Bug: webrtc:467444018
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I7630db5a5e46d320d0d1e385bede09570533ca0a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/449720
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46914}