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/platform.ts

@@ -0,0 +1,31 @@
+import { platform } from 'os';
+import { die } from './log';
+
+export enum SupportedPlatform {
+  macOS,
+  Windows,
+  Linux,
+}
+
+const NODE_PLATFORM_MAPPINGS: {
+  readonly [K in SupportedPlatform]: NodeJS.Platform;
+} = {
+  [SupportedPlatform.macOS]: 'darwin',
+  [SupportedPlatform.Linux]: 'linux',
+  [SupportedPlatform.Windows]: 'win32',
+};
+
+function findCurrentPlatform(): SupportedPlatform | undefined {
+  const nodePlatform = platform();
+
+  for (const key of Object.keys(NODE_PLATFORM_MAPPINGS)) {
+    const keyAsSupportedPlatform = parseInt(key, 10) as SupportedPlatform;
+    if (NODE_PLATFORM_MAPPINGS[keyAsSupportedPlatform] === nodePlatform) {
+      return keyAsSupportedPlatform;
+    }
+  }
+
+  return die(`Unsupported platform: ${nodePlatform}`);
+}
+
+export const CURRENT_PLATFORM: SupportedPlatform = findCurrentPlatform();