Release posts: add support for `stage_url`

Marcia Ramosrequested to merge
release-post-fix-stages-url into master
  • Closes #4829 (closed).
  • Adds support for stage_url when the devops stage page doesn't correspond to href: "/stages-devops-lifecycle/#{xxxx_feature.stage}/", fixing broken release stage links for "Growth" and "Enablement".

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