Extract test_video_capturer and test_video_capturer_video_track_source into a separate targets. Bug: b/272350185 Change-Id: Iaeefdb58de94d3a25291bfd09c39b3277c18e18a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/299060 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Artem Titov <titovartem@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39672}