removed "(Beta)" from "Auto DevOps" messages

What does this MR do?

Removes "(Beta)" from "Auto DevOps" messages.

Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41861

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41861