Move a first batch of EE-specific JS specs to ee/spec/javascripts

What does this MR do?

This moves a first batch of EE-specific JS tests to ee/spec/javascripts.

Does this MR meet the acceptance criteria?

• Conform by the code review guidelines
  • Has been reviewed by a Frontend maintainer
• EE specific content should be in the top level /ee folder
• Conform by the merge request performance guides
• Conform by the style guides
• Conform by the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• [-] End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Part of https://gitlab.com/gitlab-org/gitlab-ee/issues/3871.