Create Visualization for mean time to resolve S1-S2 functional defects

Add a top-level chart under group views in https://quality-dashboard.gitlap.com/groups/gitlab-org

Create similar visualization the same as https://docs.google.com/spreadsheets/d/1p6V_jRZDbfTx0Vlq5lpp4oREWLRKkYpn13tyBHLEEaA/edit#gid=802418754

Screen_Shot_2019-05-21_at_12.57.31_AM

  • Add 2 charts one for all bugs another for only customer bugs
  • Add rolling average line
  • Add total average, p85 and p95 percentiles
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