Meta: Simplify GitHubFileURL

[fregante]

• Reverts Fix URL parsing in Firefox #3208
• Renames the class for clarity

Context:

• 🥉 Minor codebase updates and fixes #6000 (comment)
• Extend action-pr-link to links in PRs #6797 (comment)

cc @134130

[yakov116]

I would like to test this, I will try to get to my computer tonight

[fregante]

@yakov116 ping

[yakov116]

Sorry i will try to do it in a few hours

[yakov116]

Looks like i will not have time, sorry

[fregante]

I ended up testing it myself and… in Firefox it fails silently. 🤷‍♂️

Repro:

1. Open https://github.com/refined-github/refined-github/tree/async-detections
2. Look at default-branch-button, the URL is incorrect

[134130]

Can we make some CI tests with puppeteer-like testing framework?
Enable all features, visit all given test urls, make sure there is no failed rgh-features.

[fregante]

Oof, good luck. Loading extensions in those environments is a pain, especially so in Firefox. Then nobody will add tests. 😅

[134130]

🥲🥲 Also, It'll be annoying when CI test ran on PR of A feature changes, but failing with B feature.
It breaks the pull request order and requires consideration of the merge queue.
🤯😟