Add vshumilo as backend maintainer for CustomersDot and LicensesDot

Trainee maintainer issue: https://gitlab.com/gitlab-com/www-gitlab-com/-/issues/10127

Overview

• Overall GitLab experience: 1yr and 2 months 163 MRs merged
• Trainee Backend Maintainer issue (customers-license): https://gitlab.com/gitlab-com/www-gitlab-com/-/issues/10127
• Authored MRs within CustomersDot.
• Authored MRs within LicensesDot.

Examples of reviews

• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/2945
• https://gitlab.com/gitlab-org/license-gitlab-com/-/merge_requests/263
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3211
• https://gitlab.com/gitlab-org/license-gitlab-com/-/merge_requests/271
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3233
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3247
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3252
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3261
• https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3285

Things to improve

Note to self: MRs where not all the changes are displayed or with multiples VCRs are more challenging to review without checking out the branch locally.

I have incorporated checking the branch locally as part of my review routine for any change that is not super short or straightforward to review inline.

Please let me know about any other areas where I should or can improve 🙏

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
  • 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

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cc. @cwiesner @jameslopez @rdavila @shreyasagarwal @tyleramos

Please chime in below with your thoughts, and approve this MR if you agree.