Refactor dashboard milestone show inside dispatcher (EE)

Clement Horequested to merge
ee-dispatcher-dashboard-milestone-show into master

What does this MR do?

EE Version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16304

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

None

Why was this MR needed?

performance

Screenshots (if relevant)

None

Does this MR meet the acceptance criteria?

  • Has been reviewed by Frontend

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41341

Edited by Clement Ho

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