Manually migrate MySQL visualizations to lens in current Kibana version 8.6.0 itself.

Preparation of data for testing

• Use sample_event.json / setup live instance using docker / mock data using mock server to populate dashboards

Migration stats

Dashboard : [Metrics MySQL] Database Overview

• Migrate x visualization to the lens.
  • [O11y][MySQL] Migrate [Metrics MySQL] Database Overview dashboard visualizations to lens in kibana 8.8.0 #5819

Dashboard : [Logs MySQL] Overview

• Migrate x visualization to the lens.
  • [O11y][MySQL] Migrate [Logs MySQL] Overview dashboard visualizations to lens in kibana 8.8.0 #5818

Verification and Validation

• Verification of functionality remains the same after migration in Kibana
• Verification of data count of after-migrated visualization with before-migrated visualization in Kibana
• Verification of Dashboard are not distorted in supported Kibana version (8.6.0)