[WebRTC] Add targets for rtp_packetizer_av1_fuzzer and rtp_depacketizer_av1_assemble_frame_fuzzer.
<rdar://problem/117182586>
Pull request: https://github.com/WebKit/WebKit/pull/19267
Committed 269528@main (99edd951408b): <https://commits.webkit.org/269528@main> Reviewed commits have been landed. Closing PR #19267 and removing active labels.