Improve world-writable scan (#6381)

1. scan many more directories since it's much faster than the original
implementation
2. limit overall scan time to 2s
3. skip some directories that are noisy - ApplicationData, Installer,
etc.

codex-rs/Cargo.lock

@@ -1566,6 +1566,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "dirs-next",
+ "dunce",
  "rand 0.8.5",
  "serde",
  "serde_json",