[ie/zaiko] add thumbnails from event pages

[pzhlkj6612]

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Description of your pull request and other information

Hi.

This PR improves #7254.

This commit could not be finished without help of @c-basalt.

Different thumbnails?

The newly added thumbnail, which is from the event page, may be the same as the one of "poster_url", but not always. I participated in a live event that has two different thumbnails before. A thumbnail was shown first and contained something like "there's a special guest coming". The second thumbnail, a few days later, replaced the first one and contained that special guest's name and photo. Fans were pleasantly surprised.

The first thumbnail I saw looks like this:

Local test

Unfortunately, the testing URL "ZAIKO STREAMING TEST" does not seem to work anymore, so I've tested the code with my own ticket only. I don't post the url because posting a real URL might give Zaiko a chance to find the user who shared their ticket.

{
    "id": "...",
    //...
    "thumbnails": [
        {
            "url": "https://d38fgd7fmrcuct.cloudfront.net/pf_1/1_3ybh***",
            "id": "1_3ybh***"
        },
        {
            "url": "https://media.zaiko.io/pf_1/1_3ybi***",
            "id": "1_3ybi***"
        }
    ],

> Get-FileHash *1_3yb*

Algorithm       Hash         Path
---------       ----         ----
SHA256          9B7***       ***
SHA256          C60***       ***

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Copilot Summary

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Summary

✨🔨🔍

Added support for multiple thumbnails in zaiko.py. Extracted thumbnail URLs from different sources and assigned them IDs based on their filenames.

We'll scrape the web for thumbnails, me hearties, yo ho ho
We'll use the url_basename to name them as we go
We'll fetch them from the JSON and Open Graph, you see
And store them in the zaiko extractor, one, two, three

Walkthrough

• Import url_basename function from utils module to generate thumbnail IDs from URLs (link)
• Modify _real_extract function to collect two possible thumbnail URLs from player_meta and Open Graph tags (link)
• Replace thumbnail field with thumbnails field in info_dict, using url_basename to create a list of dictionaries with id and url keys for each thumbnail (link)
• Update test case to reflect the change from thumbnail to thumbnails field, and provide two expected thumbnail URLs (link)

[pzhlkj6612]

The comment in fee7e25 about "thumbnails" is wrong:

The field "thumbnails" is ignored, see "sanitize_got_info_dict()".

The real reason to add "thumbnail" back is that the field "thumbnail" will be generated from "thumbnails" in "process_video_result()", so the test will fail if no "thumbnail" specified.

[bashonly]

Correct, but no worries about the message, commits will be squashed when merged