This commit improves the URL health checking mechanism to reduce false
negatives.
- Treat all 2XX status codes as successful, addressing issues with codes
like `204`.
- Exclude URLs within Markdown inline code blocks.
- Send the Host header for improved handling of webpages behind proxies.
- Improve formatting and context for output messages.
- Fix the defaulting options for redirects and cookie handling.
- Add URL exclusion support for non-responsive URLs.
- Update the user agent pool to modern browsers and platforms.
- Improve CI/CD workflow to respond to modifications in the
`test/checks/external-urls` directory, offering immediate feedback on
potential impacts to the external URL test.
- Add support for randomizing TLS fingerprint to mimic various clients
better, improving the effectiveness of checks. However, this is not
fully supported by Node.js's HTTP client; see nodejs/undici#1983 for
more details.
- Use `AbortSignal` instead of `AbortController` as more modern and
simpler way to handle timeouts.
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