Failing tests at webrtc.github.io/test-pages

Sub-issue of #41486 Tracks failing tests available at https://webrtc.github.io/test-pages/

These should all be resolved before attempting to get samples working

• Audio and Video Streams
• Peer connection from canvas capture stream (#41490)
• Iframe apprtc (deprecated, does any test replace this?)
• Iframe video
• Multiple audio streams (maybe passing? TODO: what's the passing condition here?)
• Multiple peer connections (#41491 (moved))
• Multiple video streams
• Multiple video devices (TODO: I don't own any external video devices, so I can't test this at the moment)
• Randomly pause and play (assumed to fail, but need confirmation)
• Peer2peer (TODO: set up a peerconnection_server to run this test)
• Peer2peer iframe (same as Peer2peer)
• Peer2peer from video (this page doesn't even load)
• Single audio stream
• Single video stream