Create service for repository blob
<!--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=333468) </details> <!--IssueSummary end--> The following discussion from !62880 should be addressed: - [ ] @jerasmus started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62880#note_597873049): (+1 comment) > **thought:** we could think about creating a `service.js` file in the `repository/` directory as we refactor so that we have one central location to manage all of our service calls as opposed to having them scattered between components. This is just something that I'd like to keep in mind as we work on this refactor so no need to change anything here.
issue