Define BoundedContext for RemoteMirrors
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=462816) </details> <!--IssueSummary end--> See documentation: https://docs.gitlab.com/ee/development/software_design.html#how-to-define-bounded-contexts New set of [`RemoteMirrors` services](https://gitlab.com/gitlab-org/gitlab/-/tree/master/app/services/remote_mirrors) was implemented before `BoundedContext` restriction was defined. We need to fix Rubocop warnings for them. ``` Gitlab/BoundedContexts: Module RemoteMirrors is not a valid bounded context. See https://docs.gitlab.com/ee/development/software_design#bounded-contexts. ```
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