Allow manual incremental rollout jobs to fail

When we migrated to rules syntax, we missed the fact that these jobs
were previously allowed to fail, see

https://gitlab.com/gitlab-org/gitlab/-/issues/218724

changelogs/unreleased/allow-manual-incremental-rollout-jobs-to-fail.yml

+---
+title: Fix Auto DevOps manual rollout jobs not being allowed to fail
+merge_request: 32865
+author:
+type: fixed

lib/gitlab/ci/templates/Jobs/Deploy.gitlab-ci.yml

@@ -86,6 +86,7 @@ staging:
 canary:
   extends: .auto-deploy
   stage: canary
+  allow_failure: true
   script:
     - auto-deploy check_kube_domain
     - auto-deploy download_chart
@@ -177,6 +178,7 @@ production_manual:
   <<: *rollout_template
   stage: production
   resource_group: production
+  allow_failure: true
   rules:
     - if: '$CI_KUBERNETES_ACTIVE == null || $CI_KUBERNETES_ACTIVE == ""'
       when: never