Add Safe-Extension option to Latex (MathJax) - #343540

What does this MR do and why?

Add Safe-Extension option to Latex (MathJax)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

1. create a new project.
2. create an ipynb file with mathjax math formula.
3. put a log at app/assets/javascripts/notebook/cells/output/latex.vue Line 35.

console.log(window.MathJax);

4. open that ipynb file on Gitlab.
5. open dev tool -> console and find window.MathJax.
6. find Object.config.loader.load, and it should be ui/safe.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.