Resolve inability to scroll operations dashboard

What does this MR do?

Allows vertical scrolling when adding enough projects to the operations dashboard to trigger a viewport overflow

What are the relevant issue numbers?

Closes #8407 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• 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