Add repo cleanup utility script.

Bug: 243966946
Test: run locally
Change-Id: I1c20161673a2cb1b300951e17d9f560310d20c0d

finalize-cleanup.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+# Brings local repository to a remote head state.
+
+# set -ex
+
+function finalize_revert_local_changes_main() {
+    local top="$(dirname "$0")"/../..
+
+    repo selfupdate
+
+    repo forall -c '\
+        git checkout . ; git clean -fdx ;\
+        git checkout @ ; git b fina-step1 -D ; git reset --hard; \
+        repo start fina-step1 ; git checkout @ ; git b fina-step1 -D ;'
+}
+
+finalize_revert_local_changes_main