Make Pavel Shutsin a backend maintainer of GitLab

Trainee maintainer issue: https://gitlab.com/gitlab-com/www-gitlab-com/-/issues/6827

Overview

Hello backend maintainers! I've been working at GitLab since beginning of 2019 as part of groupoptimize and ~"group::access" (former manage) groups and trainee maintainer for over a year. During that time I contributed over 200 MRs, approved over 200 merged MRs

Examples of reviews

• gitlab-org/gitlab!69546 (merged)
• gitlab-org/gitlab!70278 (merged)
• gitlab-org/gitlab!67259 (merged)
• gitlab-org/gitlab!66385 (merged)
• gitlab-org/gitlab!64466 (merged)

Things to improve

Keep an eye on spec performance, keep learning about various product areas

@gitlab-org/maintainers/rails-backend please chime in below with your thoughts, and approve this MR if you agree.

Developer checklist

• Before this MR is merged
  • Mention @gitlab-org/maintainers/rails-backend, if not done (this issue template should do this automatically)
  • Assign this issue to your manager
• After this MR is merged
  • Request a maintainer from the #backend_maintainers Slack channel to add you as an Owner to gitlab-org/maintainers/rails-backend
  • Consider adding 'backend maintainer' to your Slack notification keywords

Manager checklist

• Before this MR is merged
  • The MR has been open for 5 working days
  • More than half of the existing maintainers approve the MR (meaning more than 27 approve, because there are currently 54 maintainers)
  • There are no blocking concerns raised (if there are, please follow https://about.gitlab.com/handbook/engineering/workflow/code-review/#how-to-become-a-project-maintainer)
• After this MR is merged
  • Announce the good news in the relevant channels listed in https://about.gitlab.com/handbook/engineering/#keeping-yourself-informed