Remove search_query_milestone_builder feature flag

What does this MR do and why?

Related to #473270 (closed) and #462684 (closed)

FF has been enabled in production: #473270 (comment 2060716704)

Removal of FF from code and specs

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

N/A

How to set up and validate locally

  1. setup gdk for elasticsearch
  2. test searching for milestones at each level:
  1. repeat test with admin, logged in user, and anonymous user
Edited by Terri Chu

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