We should increase the visibility and provide clarity as to which start and end time interval is being shown on the SQL Activity pages since we are showing the last full hour.

Few options:

1. Remove the 'Past 10 minutes' and 'Past 30 minutes' since we always show only the past full hour
2. Prominently Highlight in the UI the intervals we are showing stats for since a custom time or 'Past 1 hour' could fall within an hour

CC @Annebirzin

Jira issue: CRDB-16725