trying to only use next endpoint for the major data

[unixfox]

Description

This PR aims to avoid throwing a raw error and instead display all the data that we can extract from the /next endpoint but without displaying the "player" (video.js) element.

This is one big step towards https://github.com/iv-org/invidious/pull/4985. Invidious will have to be able to display the watch page even when YouTube is blocking the IP.

This will give the same result as on www.youtube.com:

This way the user can still view the title of the video, accessing the channel page, viewing the comments and much more which is not yet blocked.

What changed?

• The watch page is displayed properly but without the player if an error is found.
• All the important data like title, viewcount is fetched from /next endpoint is unable from the /player endpoint.
• The error message now throws the reason AND the subreason. Makes it clearer to the user what's really happening.

TODO

• [ ] Integrate the embed page with the changes
• [ ] Display the subreason on the watch page when there is an error
• [ ] Fix description
• [ ] Add mocks for a video without videoDetails

Try these videos ID for testing - on both a blocked IP and a not blocked one

• 98TyXNPdMRo (private video)

• 7KSfDyainYU (georestricted video)

• KIuDBxqz__k (familySafe no)

• yqaS07znJWY (unlisted video)

• aaaaaaaaaaaa (notfound video)

Fixes

• Closes #4744

[ic-scm]

Thank you very much for this. Looking at instance yewtu.be which uses invidious-custom, it seems to be working just as expected, exactly as described in my linked issue, and with a 100% success rate.

Thank you for this great work - this is a huge step towards making Invidious convenient to use again. For me personally, it solves the entire problem.

The only thing I can potentially suggest is for the video thumbnail to be loaded and displayed on the page, separately from the broken video player. But that would be just a nice-to-have feature, and I'm guessing it may not be trivial to implement, when the official Youtube website just shows a black error screen, with the thumbnail nowhere to be seen.