[YouTube] Support new metadata format of playlists #958
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This PR adds support of the new playlist layout which is currently A/B tested. This new layout doesn't provide the uploader avatar.
This fixes the extraction of the videos count and the uploader name when this interface is got by the extractor.
The code of learning playlists video count check has been also removed, as it seems to be not relevant anymore (the video count seems to be returned for these playlists with both layouts).
Finally, unneeded overrides of subchannel methods, which don't apply to the YouTube service, have been removed.