Reland^2: Fix CheckForRecursedeps to work for submodule based gclient DEPS

This reverts commit 7d6d4424b5.

Change-Id: Ibb05a6b6db2babef525a4230c01785570e074161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6336451
Auto-Submit: Josip Sokcevic <sokcevic@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@google.com>
Commit-Queue: Robbie Iannucci <iannucci@google.com>

presubmit_support.py

@@ -1435,6 +1435,10 @@ class Change(object):
         """Returns local paths for affected submodules."""
         return [af.LocalPath() for af in self.AffectedSubmodules()]
 
+    def AllLocalSubmodules(self) -> set[str]:
+        """Returns local paths for all submodules."""
+        return set(self._repo_submodules())
+
     def AbsoluteLocalPaths(self):
         """Convenience function."""
         return [af.AbsoluteLocalPath() for af in self.AffectedFiles()]