Render non-block (Markdown and/or HTML) markup inside snippet titles.
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### Release notes
Snippet titles now support inline markup.
### Problem to solve
Although markup is now permitted in issue, merge request, work item, and epic titles, [^1] it is not permitted in snippet titles.
[^1]: [`issues/476513`](https://gitlab.com/gitlab-org/gitlab/-/issues/476513#note_2241826386)
### Proposal
Permit equivalent markup in snippet titles.
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### Feature Usage Metrics
Usage should be tracked.
### Does this feature require an audit event?
Likely, although if existent code is reused, it shouldn't be problematic.
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