Fix "All unit tests" command to return correct exit code

Change-Id: I65b7a4f4aca554c70efb5e1eec258ca620284191

Author: asyash26

buildscripts/scripts/stages.yml

@@ -326,7 +326,7 @@ STAGES:
               -//packages/cmk-frontend/... \
               -//non-free/packages/cmc/... \
               -//non-free/packages/cmk-relay-engine/... \
-              -//non-free/packages/cmk-update-agent/... \
+              -//non-free/packages/cmk-update-agent/...
           make_rc=$?
           set -e
           ../buildscripts/scripts/bazel_test_post_archive_xunit.sh || :