Draft: Reenable tooltips in VSD sparkline chart

What does this MR do and why?

Reenables pointer events on the table cell containing the sparkline chart in the Value Streams Dashboard so that tooltips can appear on hover.

Screenshots or screen recordings

Before	After
Screen_Recording_2023-03-08_at_12.05.11_PM	Screen_Recording_2023-03-08_at_12.04.15_PM

How to set up and validate locally

• Seed cycle analytics data
• Create an environment from the UI named production
• Open the rails console

  $ rails c

• Seed DORA daily metrics in the environment using the new environment

  // Within the rails console
  e = Environment.order(:id)[-1]
  100.times { |i| Dora::DailyMetrics.create(environment_id: e.id, date: (i + 1).days.ago, deployment_frequency: rand(50), incidents_count: rand(5), lead_time_for_changes_in_seconds: rand(50000), time_to_restore_service_in_seconds: rand(100000)) }

• Enable the Exec dashboard

  Feature.enable(:group_analytics_dashboards_page)

• Visit the exec dashboard: http://gdk.test:3000/groups/${YOUR_GROUP}/-/analytics/dashboards

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #391739 (closed)