#13126628 Trail Map: Best for ecommerce label for ecommerce plan

Related to #90301

Proposed Changes

• Adds a label for ecommerce plan for the trail map variants

Testing Instructions

• Make sure the available in the following feature flag views
  • Go to http://calypso.localhost:3000/start/plans?flags=onboarding/trail-map-feature-grid-structure
  • Go to http://calypso.localhost:3000/start/plans?flags=onboarding/trail-map-feature-grid-structure-copy
  • Go to http://calypso.localhost:3000/start/plans?flags=onboarding/trail-map-feature-grid-structure-structure
• Go to /start/plans and make sure the label is not visible

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• https://wpcalypso.wordpress.com/devdocs/docs/testing/index.md for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the “[Status] String Freeze” label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the “[Status] Needs Privacy Updates” label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?