Fix: Set z-index of stats in timeseries to avoid pointer events on scrub.

Created by: nayakrahul

Description of PR This PR fix the issue when you hover over stats in timeseries charts. Before: the hover action over stats doesn't make appropriate changes in focus dot rather it resets the same. After: the hover action makes appropriate changes around all the regions in timeseries including stats region.

Type of PR

• Bugfix
• New feature

Relevant Issues
Fixes #1347 (closed)

Checklist

• Compiles and passes lint tests
• Properly formatted
• Tested on desktop
• Tested on phone

Screenshots Before After