Bring back "Add gitlab-metrics-exporter project"
What does this MR do and why?
The original change had to be reverted in !1956 (merged) due to a problem with the GME version value we set in Rails.
That problem is being fixed in gitlab!93656 (merged), to which I added an MR dependency.
Author Check-list
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Has documentation been updated?
Edited by Matthias Käppler