Removed service_desk webpack bundle tag

What does this MR do?

Removes service_desk webpack bundle tag

Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41341

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/41341