Patches changes from ce to ee for explore-dispatcher-refactor.

What does this MR do?

EE branch for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16296

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

No

Why was this MR needed?

EE patch for CE.

Screenshots (if relevant)

No

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16296