SDK / exoplayer

We currently don't display the last frame because the seek time is behind the
last frame's timestamps and it's thus marked as decodeOnly.

This case can be detected by checking whether all data sent to the codec is
marked as decodeOnly at the time we read the end of stream signal. If so, we
can re-enable the last frame. This should work for almost all cases because the
end-of-stream signal is read in the same feedInputBuffer loop as the last
frame and we therefore haven't released the last frame buffer yet.

Issue:#2568
PiperOrigin-RevId: 251425870