Draft: Refactor User#follow into a service

Justin Zengrequested to merge
gitlab-community/gitlab-org/gitlab:375061-refactor-user-follow-into-service into master
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What does this MR do and why?

Refactor User#follow into a service

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #375061

Edited by 🤖 GitLab Bot 🤖

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