docs: updates for GitLab Duo CLI GA

Uma Chandranrequested to merge
uc/duo-cli-ga-docs into main

Description

Updates the docs to reflect the GitLab Duo CLI GA.

  • Removes beta labels and notes
  • Removes the pre-req to enable beta features
  • Adds some GitLab before Duo mentions per the style guide / legal guidance
  • Updates the pre-reqs to list the new minimum GitLab version requirement for GA, and to mention the GitLab Duo CLI access setting. It is on by default, but we should list it as a pre-req in case they've turned it off at some point.

Related issues and merge requests

Documentation

If this MR adds or updates CLI command documentation, follow the conventions in the GitLab CLI (glab) documentation style guide, run make gen-docs, and commit the updated files in docs/source/.

Edited by Uma Chandran

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