[ie/Bild.de] fix extraction when HLS formats are available (fixes #7951)

[barsnick]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

Previously, only static download formats were supported. With the appearance of (additional) HLS formats, the extractor broke when they are available.

This PR adds the handling of those HLS formats in addition to the static one(s).

Fixes #7951

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)
• I don't quite understand. I am not the original author of the code, I am only fixing it. I don't know if the original code is under Public Domain or Unlicense. I place my contribution under either, if desired.

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 3f5fcd7

Summary

🛠️🆕🎞️

Improved the bild extractor to handle more video scenarios and formats. Added a test and extracted HLS and MP4 from videoData.

Sing, O Muse, of the skillful coder who improved the bild extractor
And made it work with various URLs and sources of video streams
He added a new test to verify his clever work and extracted
The formats of HLS and MP4 from the data, like Hermes stealing Apollo's herds

Walkthrough

• Modify the URL regex and the test cases to support different video page formats and sources (link, link)
• Extract and return multiple video formats from the video data, preferring HLS over MP4 (link)
• Use the _extract_m3u8_formats method to parse the HLS manifest and add the formats to the list (link)
• Assign the format IDs hls and http-mp4 to the HLS and MP4 sources respectively (link)