Improve YouTube page feed detection

In order to be more resilient to YouTube URLs variation and
to address this feature_request: https://github.com/miniflux/v2/issues/2628
I've reworked a bit the way the YouTube feed extraction is done.

I've kept all the `FindSubscriptionsFromYouTube*` in order
to keep all the existing unit tests as-is ensuring little to no
regressions. By doing so, I had to call twice `youtubeURLIDExtractor`.
Small performance penalty for peace of mind in my opinion.

`youtubeURLIDExtractor` is made in a way only one kind
of page can be detected at a time. This mean I can
solve the "video in a playlist" feature_request
by prioritizing the playlist ID over the Video ID

Also, by using `url.Parse()` to get ids, it's safer
to url mangle and variation. The most common variation
being the `t=42` parameters that start the playback
at a given position. Previously, this kind of url
would not be detected as "YouTube URL".

I deliberately ignored the url parsing error
to keep previous behavior (skip the YouTube analysis and follow with the other analysis)

I also tried to keep debug logs the same as before as much as I could.

I manually tested all the YouTube cases (video,channel,playlist)
and they all work as expected except for the video. But this one
does not work either on main. The `meta` html tag that was searched for
does not seem to exist anymore.

fix: #2628

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