Script updates.

- add a mode to disable finalization steps if they were already merged,
- add the extension version into commit message.

Bug: 243966946
Test: local run
Change-Id: I51505e5d5715b56f3b385d714e1aabaae06f58ed
diff --git a/tools/finalization/update-step-2.sh b/tools/finalization/update-step-2.sh
index e65d35a..d2b8592 100755
--- a/tools/finalization/update-step-2.sh
+++ b/tools/finalization/update-step-2.sh
@@ -1,6 +1,11 @@
 #!/bin/bash
 # Script to perform a 2nd step of Android Finalization: REL finalization, create CLs and upload to Gerrit.
 
+# WIP, does not work yet
+exit 10
+
+set -ex
+
 function update_step_2_changes() {
     set +e
     repo forall -c '\