[ie/crunchyroll] Remove initial state scrape

[Grub4K]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

This PR removes the initial state scraping, saving one request. The initial state payload was removed from the webpage, and so we hardcode these values instead.

It also tries to adds a more helpful message for 403 workaround (#7442).

Fixes #7624

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

Copilot Summary

🤖 Generated by Copilot at 06d280f

Summary

🛠️🌐✅

Improve Crunchyroll extraction by using better API parameters, handling errors, and fixing a bug.

Crunchyroll extracts
With client IDs, locale
Cloudflare cut off

Walkthrough

• Add and use class attributes for client IDs and locale codes (link, link, link)
• Refactor and improve base extractor methods (link, link)
• Fix minor bug in beta extractor URL regex (link)
• Add test case for beta extractor with German language URL (link)

[ProDev2]

Works perfectly for me! Thank you. Also I checked the code and it shouldn't cause any merge conflicts with my PR (#7009) after you merge it to master.

[Grub4K]

This PR and build aim to fix both the 403 and the initial state error.
If working correctly, the 403 should no longer be present.
If it still is, please let me know the specific region and OS that failed in a comment with a verbose (-v) log.

If it fails, there is still a way to do the workaround as discussed here:

• Extract your current User-Agent from the browser
  • This can be done using google/duckduckgo/... by searching for "my user-agent"
• Open a crunchyroll.com page in the browser
• Load cookies from the browser into yt-dlp
  • Use either --cookies-from-browser or --cookies
• Pass the previously extracted User-Agent to yt-dlp
  • Use --user-agent <your_user_agent>
• Additionally, pass the flag to disable the automatic workaround
  • --extractor-arg crunchyrollbeta:ua_workaround

To test, first get the build in one of the following ways:

• update diretly from a regular builds: yt-dlp --update-to Grub4K/yt-dlp@2023.07.18.215323
• download it from the pr-branch pre-release
• run from source: git checkout git@github.com:Grub4K/yt-dlp.git,
  then git switch fix/crunchy-initial-state
• install using pip: python3 -m pip install -U pip setuptools wheel, then python3 -m pip install --force-reinstall https://github.com/Grub4K/yt-dlp/archive/fix/crunchy-initial-state.tar.gz

Afterwards, try and run through the above steps, letting me know of any further errors.

[bashonly]

@hajimekun Doesn't sound like it would be related. You can open a new issue if you think it should be looked into