Update PreviewMarkdown to support references in personal snippets

Asherah Connorrequested to merge
push-nzlrkypwqxkn into master

What does this MR do and why?

Update PreviewMarkdown to support references in personal snippets.

The PreviewMarkdown concern wasn't passing :user in context for snippets; without a project, group or user, all reference parsing is skipped, so they simply didn't resolve in preview.

We pass user: current_user in the snippet preview context so fully-qualified cross-project references (e.g. group/project#nnn) resolve during live preview, same as when actually rendered on save.

Added an extra spec to assert CrossProjectReference's behaviour with only :user context.

References

Fixes Refactor preview markdown for PersonalSnippets (#232950).

Screenshots or screen recordings

Before After
image image

How to set up and validate locally

  1. Check out the branch locally.
  2. Ensure the personal_snippet_reference_filters FF is on for best results.
  3. Edit a personal snippet (start at http://gdk.test:3000/-/snippets), and type in a full reference to an issue/MR/work item.
  4. It should render correctly on save.
  5. Click edit again. In the rich-text editor, it should appear as a link. In the plain-text editor, "Preview" should also show it as a link correctly.

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