[Enhancement] Drop usage of microFormat in player endpoint

[unixfox]

Since https://github.com/iv-org/invidious/pull/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 https://github.com/iv-org/invidious/pull/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