[Enhancement] Drop usage of microFormat in player endpoint

[unixfox]

Since #4928, microformat is not available anymore from the player endpoint when using the client configured with po_token.

We should try to use something else, like from the next endpoint or from videoDetails.

What to migrate:

• lengthSeconds: can be found in videoDetails, already a fallback
• publishDate
• premiere_timestamp
• live_now
• allowed_regions
• family_friendly
• description: fallback is already from next endpoint
• genre

[absidue]

I have opened #4934 to fix the live_now and premiere_timestamp fields.

[syeopite]

Considering that the workaround is now broken I wonder if it'll make more sense to just revert the fix altogether rather than migrating everything away from microformat

Right! The fix still works on some IPs