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/external-urls/StatusChecker/ExponentialBackOffRetryHandler.ts

@@ -1,27 +1,33 @@
 import { sleep } from '@/infrastructure/Threading/AsyncSleep';
-import type { IUrlStatus } from './IUrlStatus';
+import { indentText } from '@tests/shared/Text';
+import { type UrlStatus, formatUrlStatus } from './UrlStatus';
 
 const DefaultBaseRetryIntervalInMs = 5 /* sec */ * 1000;
 
 export async function retryWithExponentialBackOff(
-  action: () => Promise<IUrlStatus>,
+  action: () => Promise<UrlStatus>,
   baseRetryIntervalInMs: number = DefaultBaseRetryIntervalInMs,
   currentRetry = 1,
-): Promise<IUrlStatus> {
+): Promise<UrlStatus> {
   const maxTries = 3;
   const status = await action();
   if (shouldRetry(status)) {
     if (currentRetry <= maxTries) {
       const exponentialBackOffInMs = getRetryTimeoutInMs(currentRetry, baseRetryIntervalInMs);
-      console.log(`Retrying (${currentRetry}) in ${exponentialBackOffInMs / 1000} seconds`, status);
+      console.log([
+        `Attempt ${currentRetry}: Retrying in ${exponentialBackOffInMs / 1000} seconds.`,
+        'Details:',
+        indentText(formatUrlStatus(status)),
+      ].join('\n'));
       await sleep(exponentialBackOffInMs);
       return retryWithExponentialBackOff(action, baseRetryIntervalInMs, currentRetry + 1);
     }
+    console.warn('💀 All retry attempts failed. Final failure to retrieve URL:', indentText(formatUrlStatus(status)));
   }
   return status;
 }
 
-function shouldRetry(status: IUrlStatus) {
+function shouldRetry(status: UrlStatus): boolean {
   if (status.error) {
     return true;
   }
@@ -32,14 +38,14 @@ function shouldRetry(status: IUrlStatus) {
     || status.code === 429; // Too Many Requests
 }
 
-function isTransientError(statusCode: number) {
+function isTransientError(statusCode: number): boolean {
   return statusCode >= 500 && statusCode <= 599;
 }
 
 function getRetryTimeoutInMs(
   currentRetry: number,
   baseRetryIntervalInMs: number = DefaultBaseRetryIntervalInMs,
-) {
+): number {
   const retryRandomFactor = 0.5; // Retry intervals are between 50% and 150%
   // of the exponentially increasing base amount
   const minRandom = 1 - retryRandomFactor;