Migrate old notes app test from Karma to Jest

What does this MR do?

Migrates the spec/javascripts/notes_spec.js to Jest in spec/frontend/notes/old_notes_spec.js.

Fixes #60335 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.