Improve URL checks to reduce false-negatives

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.

tests/checks/desktop-runtime-errors/check-desktop-runtime-errors/app/system-capture/window-title-capture.ts

@@ -1,7 +1,7 @@
+import { filterEmpty } from '@tests/shared/Text';
 import { runCommand } from '../../utils/run-command';
 import { log, LogLevel } from '../../utils/log';
 import { SupportedPlatform, CURRENT_PLATFORM } from '../../utils/platform';
-import { filterEmpty } from '../../utils/text';
 
 export async function captureWindowTitles(processId: number) {
   if (!processId) { throw new Error('Missing process ID.'); }