Update current DevOps Score UI to Vue

Problem to solve

• Current DevOps Score UI is clunky and not using Vue components
• New UI doesn't allow for much expansion because it relies on horizontal metrics display
• We are also planning on moving this feature down to group-level, so UI needs to be adaptable

Proposal

• For MVC: We just translate the existing UI and calculations into a single stat and table
• Later: Add additional metrics section (e.g. Security) & include DORA metrics (#271223 (closed))