Remove broken metric for unique authors
What does this MR do and why?
Contributes to #382724 (closed)
This reverts commit eb6902ae.
We already have a similar metric: https://metrics.gitlab.com/?q=redis_hll_counters.code_review.i_code_review_user_create_mr_monthly
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Vasilii Iakliushin