Follow-up from "Add prefix to autocomplete path"
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=335239) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=335239) </details> <!--IssueSummary end--> The following discussion from !65508 should be addressed: - [ ] @tomquirk started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/65508#note_619127355): (+1 comment) > **suggestion (non-blocking)**: perhaps we could have a single function to build autocomplete paths, and use this every time we need an autocomplete endpoint: > > ``` > const autocompletePath = (filename = '') => `${gon.relative_url_root || ''}/-/autocomplete/${filename}` > ```
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