Fix reference to node_modules for emoji unicode versions

What does this MR do?

• Copy node_modules/emoji-unicode-version/emoji-unicode-version-map.json to fixtures/emojis/emoji-unicode-version-map.json which is still available in a built, packaged version of GitLab

Thanks @mikegreiling for the path suggestions 👍

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

node_modules isn't available in a built packaged version of GitLab.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #29192 (closed)

cc @DouweM @iamphill @mikegreiling