[YouTube, misc] Back-ports from yt-dlp for broken YT player 2b83d2e0 and later
#33189
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This PR primarily addresses the problem of #33186. It includes a version of the interim fix from yt-dlp/yt-dlp#14398 (fixes #33187): thx @seproDev.
The PR also includes these changes:
available_at(timestamp) format key and use it to implement the now required preroll waiting period for YT, as in [ie/youtube] Fix extractor yt-dlp/yt-dlp#14081: thx @bashonly