Render snippet title in backend using issuable title pipeline

Asherah Connorrequested to merge
push-rululsmkkkws into master

What does this MR do and why?

First half of a fix for Render non-block (Markdown and/or HTML) markup ... (#577274). Note that, contrary to that work item, issue/MR/work item titles don't support full markup: just backtick code spans. This change brings consistency with this to snippets.

Note well, however, that this is only the backend change, which:

  1. Changes the render of the already-existing title_html to use the new pipeline; and,
  2. Exposes title_html via GraphQL.

Because (2) is new (we currently have but don't use title_html), we can't do the frontend change in the same MR.

That work follows (must be merged in a following milestone), at which point this becomes user-visible.

How to set up and validate locally

No user-facing changes yet, but you can confirm it's doing the right thing on the backend:

  1. Check out this branch.

  2. Go make a snippet with a title containing an inline code span, e.g.:
    image

  3. Confirm the title_html render in gdk rails console:

    [1] pry(main)> Snippet.find(44).title_html
  Snippet Load (0.3ms)  SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 44 LIMIT 1 /*application:console,db_config_database:gitlabhq_development,db_config_name:main,console_hostname:aconnor--20250904-77Q07,console_username:kivikakk,line:(pry):2:in `__pry__'*/
=> "yummy <code>snippy</code> wahoo"

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Edited by Asherah Connor

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