Stops the expand button in reports from expanding

What does this MR do?

The "Expand" button in reports (junit and security) was being too true to its name and expanding to fit the report box. This is a side effect of the flex-box styles applied to the report. The easiest way around it is to pop the button in a div like the other buttons.

Screenshots

Before

After

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.
• Tested in all supported browsers