When a DEPS file changes we need to verify at presubmit all
other files sitting in the same dir as the DEPS file (& below
recursively).

Bug: v8:9692
Change-Id: I7ae3b4cec5ab3bf970f0d04afe54e8f40138b819
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803644Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64034}