Remove preview_markdown from the global obj
What does this MR do?
https://gitlab.com/gitlab-org/gitlab-ce/issues/38869
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
https://gitlab.com/gitlab-org/gitlab-ce/issues/38869
Screenshots (if relevant)
None
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Review
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Has been reviewed by Frontend
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered