ci/cd: trigger URL checks more, and limit amount

Fix all URL checks failing in GitHub runner due to:

- Missing Happy Eyeballs in Node.js
  nodejs/undici$1531
  nodejs/node$41625
- Missing IPv6 support in GitHub runners:
  actions/runner$3138
  actions/runner-images$668

Tried (did not work):

1)

```
import dns from 'dns';
dns.setDefaultResultOrder('ipv4first');
```

2) Bumping node to v20.

3) TODO: Try autoSelectFamily

- Or is it due too to many max connections? Test this.
  Mentioned in comment nodejs/node$41625.

Key changes:

- Run URL checks more frequently on every change.
- Introduce environment variable to randomly select and limit URLs
  tested, this way the tests will provide quicker feedback on code
  changes.

Other supporting changes:

- Log more information about test before running the test to enable
  easier troubleshooting.
- Move shuffle function for arrays for reusability and missing tests.

src/application/Common/Shuffle.ts

@@ -0,0 +1,12 @@
+/*
+  Shuffle an array of strings, returning a new array with elements in random order.
+  Uses the Fisher-Yates (or Durstenfeld) algorithm.
+*/
+export function shuffle<T>(array: readonly T[]): T[] {
+  const shuffledArray = [...array];
+  for (let i = array.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [shuffledArray[i], shuffledArray[j]] = [shuffledArray[j], shuffledArray[i]];
+  }
+  return shuffledArray;
+}