WIP: Remove slash commands from markdown preview
What does this MR do?
Separates GFM slash commands from the markdown preview.
Why was this MR needed?
User requested.
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Closes #21531 (closed)