Replace static fixture for project_title_spec.js

What does this MR do?

Use the already existing dynamic fixture issues/open-issue.html (!6059 (merged)) in project_title_spec.js instead of the static fixture project_title.html.haml.

What are the relevant issue numbers?

#24753 (moved)

changelogs/unreleased/dynamic-project-title-fixture.yml

+---
+title: Replace static fixture for project_title_spec.js
+merge_request: 9175
+author: winniehell