Backport empty panel heading from EE related issues

What does this MR do?

Backport empty panel heading from EE related issues, https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1797/

Added by https://gitlab.com/gitlab-org/gitlab-ee/commit/4b5a1c9a6570d70cd3e16b3c1d3c2ec0471f46eb#777d5694836def44d2a73f1c7590aea20aed6c22_35_35

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

• Do we want this unused style in CE?
  • Better avoid conflicts by having it mirrored 🤔

Does this MR meet the acceptance criteria?

• Tests
  • 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?