[ie/RTVSLO] Fix format extraction

[bashonly]

Fixes #8020

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

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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 91a4b7d

Summary

🛠️🧪🚫

Enhance the rtvslo extractor to handle more formats and protocols, and update tests and imports.

The rtvslo extractor was slow
And had some issues to undergo
So they imported utils
And updated the rules
To skip protocols they don't know

Walkthrough

• Import int_or_none function to parse integers from metadata (link)
• Update ext field of test case to match actual video format (link)
• Add test case for 365.rtvslo.si domain with expected metadata (link)
• Skip unsupported f4m and dash protocols when extracting wowza formats (link)
• Refactor and improve format extraction from mediaFiles list using traverse_obj function and add support for hls_sec stream (link)

[coletdjnz]

lgtm