Move the remaining EE-specific JS files to ee/

What does this MR do?

This moves the remaining EE-specific JS files to ee/ and remove app/assets/javascripts from the whitelist of the ee-files-location-check job so that no new EE-specific JS files will be added to another folder than ee/.

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Related to https://gitlab.com/gitlab-org/gitlab-ee/issues/4536.