Reorder adaptive video track preferences.

This change moves the video track selection to the generic
selection method introcuced for audio and text. This ensures
we can apply the same criteria for fixed and adaptive video
track selections. Implicitly, this reorders the preferences
for adaptive tracks to give non-quality preferences (like
preferred MIME type or preferred role flags) a higher priority
than number of tracks in the selection.

Issue: #9519
PiperOrigin-RevId: 422310902

RELEASENOTES.md

@@ -31,6 +31,9 @@
     *   Disable automatic speed adjustment for live streams that neither have
         low-latency features nor a user request setting the speed
         ((#9329)[https://github.com/google/ExoPlayer/issues/9329]).
+    *   Update video track selection logic to take preferred MIME types and role
+        flags into account when selecting multiple video tracks for adaptation
+        ((#9519)[https://github.com/google/ExoPlayer/issues/9519]).
 *   Android 12 compatibility:
     *   Upgrade the Cast extension to depend on
         `com.google.android.gms:play-services-cast-framework:20.1.0`. Earlier