Fix dropdown location on the monitoring charts

What does this MR do?

Fix the location of the dropdown of the monitoring charts

Screenshots

Desktop	Small viewports	Mobile viewports

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

related to #34168 (closed)