Refactor and improve external URL checks

- Move external URL checks to its own module under `tests/`. This
  separates them from integration test, addressing long runs and
  frequent failures that led to ignoring test results.
- Move `check-desktop-runtime-errors` to `tests/checks` to keep all
  test-related checks into one directory.
- Replace `ts-node` with `vite` for running
  `check-desktop-runtime-errors` to maintain a consistent execution
  environment across checks.
- Implement a timeout for each fetch call.
- Be nice to external sources, wait 5 seconds before sending another
  request to an URL under same domain. This solves rate-limiting issues.
- Instead of running test on every push/pull request, run them only
  weekly.
- Do not run tests on each commit/PR but only scheduled (weekly) to
  minimize noise.
- Fix URLs are not captured correctly inside backticks or parenthesis.

tests/checks/desktop-runtime-errors/check-desktop-runtime-errors/utils/text.ts

@@ -0,0 +1,22 @@
+export function indentText(
+  text: string,
+  indentLevel = 1,
+): string {
+  validateText(text);
+  const indentation = '\t'.repeat(indentLevel);
+  return splitTextIntoLines(text)
+    .map((line) => (line ? `${indentation}${line}` : line))
+    .join('\n');
+}
+
+export function splitTextIntoLines(text: string): string[] {
+  validateText(text);
+  return text
+    .split(/[\r\n]+/);
+}
+
+function validateText(text: string): void {
+  if (typeof text !== 'string') {
+    throw new Error(`text is not a string. It is: ${typeof text}\n${text}`);
+  }
+}