Add Dmitry Gruzd as a trainee maintainer
Why is this change being made?
Swap my reviewer status to trainee_maintainer for backend.
Original issue: #6765 (closed)
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by Dmitry Gruzd