Extend early adopters feature set

What does this MR do?

Adds missing features that are present in EEP+EES that are not in early adopters.

Are there points in the code the reviewer needs to double check?

@DouweM @smcgivern Can you review it?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-com/support-forum/issues/2398