Remove `markdown_rust` feature flag
What does this MR do and why?
Removes the feature flag markdown_rust
that was introduced in Use Rust based markdown parser for backend (!139825 - merged)
The flag has been on for all of gitlab.com for a couple weeks now.
One problem that cropped in the %16.8 release due to compilation problems (not due to the feature flag itself), glfm_markdown issue with 16.8.0 aarch64 EL8 rpm (omnibus-gitlab#8382 - closed), has been fixed in 16.8.1
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Related to #437944 (closed)
Edited by Brett Walker