[roll] Roll fuchsia [bazel][tools] Removing unused clean_repo.py

This removes the clean_repo.py tool. It is not referenced in the
build rules and is somewhat obsolete due to migrating the package
server functionality to the standalone repo server.

Original-Bug: 376678251

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1152854
Original-Revision: ad3cca254e7ce3122563fef2d23206ea1ea52033
GitOrigin-RevId: 4f370ab14597e98774b21358578e9cc6c09578e8
Change-Id: I671a401fc39add03f3d7f8451e4b4bed6d6a80e2

Author: Clayton Wilkinson

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="81694492ff21f7bf600afbdaf306c21846517a39"/>
+             revision="ad3cca254e7ce3122563fef2d23206ea1ea52033"/>
   </projects>
   <hooks>
     <hook name="install-environment"