Fix multi-line comments highlighting (highlight.js)

What does this MR do and why?

Fixes the multi-line comments highlighting issue when highlighting with highlight.js

⚠ changes in this MR are behind the highlight_js feature flag.

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Enable the highlight_js feature flag
2. Open a file containing multi-line comments

MR acceptance checklist

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