Improve performance of tags controller

Alejandro Rodríguezrequested to merge
17073-tagscontroller-index-is-terrible-response-time-goes-up-to-5-seconds into master

What does this MR do?

  • Update to gitlab_git 10.4 and take advantage of preserved Ref objects
  • Update version_sorter and use a more efficient approach for sorting tags

What are the relevant issue numbers?

Closes #17073 (closed)

Does this MR meet the acceptance criteria?

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