Update `preview_markdown` path in frontend
What does this MR do and why?
Update preview_markdown
path in frontend (#442218)
Update paths in the frontend to use /-/preview_markdown
instead of /preview_markdown
which is now a deprecated route
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Screenshots or screen recordings
How to set up and validate locally
Test previewing markdown in an issue design comment, the ide editor, and task comment
Related to #442218
Edited by Coung Ngo