Add AUTOGENERATED comment to helm-jobs

Ruamel is a little too sensitive to subtle changes in YAML when
preserving comments.  The compact form of list in [test-chart]
trips it up.  Reorder the job definition to avoid that and add
the standard AUTOGENERATED comment.

Change-Id: I738679aa5ab2575872f67e13ab4cafa8b34a20ed

zuul-tests.d/helm-jobs.yaml

@@ -3,14 +3,19 @@
     description: Test the helm-lint job
     parent: helm-lint
     tags: all-platforms
-    files:
-      - playbooks/helm-lint/.*
-      - roles/helm-lint/.*
-      - roles/ensure-helm/.*
     pre-run: test-playbooks/helm-lint/create-helm-chart.yaml
     vars:
       helm_version: 3.10.1
       helm_charts: [test-chart]
+    files:
+      - playbooks/helm-lint/.*
+      - roles/helm-lint/.*
+      - roles/ensure-helm/.*
+
+# -* AUTOGENERATED *-
+#  The following project section is autogenerated by
+#    tox -e update-test-platforms
+#  Please re-run to generate new job lists
 
 - job:
     name: zuul-jobs-test-helm-lint-centos-7