Add gitlab-workhorse version to admin dashboard
What does this MR do?
Add gitlab-workhorse version to admin dashboard.
What are the relevant issue numbers?
Closes #15418 (closed)
Screenshot
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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Add test - show Gitlab Workhorse version on Admin Dashboard -
All builds are passing
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Branch has no merge conflicts with master(if you do - rebase it please)