Replace $.get in render math with axios

What does this MR do?

Replace $.get in render math with axios

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

globalEval() is used in this MR. We were already use it as an underlying function (getScript()) but in this MR, we are actually directly calling it.

Why was this MR needed?

jQuery ajax => axios

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/42397