Resolve "Transient failure of dashboard_spec.js"

What does this MR do?

Resolve transient karma spec failures in the ops dashboard dashboard_spec.js

What are the relevant issue numbers?

Closes #8255 (closed)

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• EE specific content should be in the top level /ee folder