Follow-up from "Add prefix to autocomplete path"

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The following discussion from !65508 (merged) should be addressed:

• @tomquirk started a discussion: (+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}`