#7892982 Woo Express Performance: Plans page copy changes

Fixes #74899

Proposed Changes

• Update the plan name in the plans-list (Woo Express Performance to Performance)
• Change the plans sub header text for Performance and trial plan sites

Original subheader copy

See and compare the features available on each WordPress.com plan.

Woo Express subheader copy

Discover what’s available in your Woo Express plan.

Testing Instructions

• Apply this patch or use the calypso.live link.

Non-Woo Express site

• Create any non-Woo Express site. A free site is the easiest.
• Go to /plans/:siteSlug.
• You should see the original plans subheader copy.

Woo Express Trial site

• Create a Woo Express trial site by going to /setup/wooexpress.
• Go to /plans/:siteSlug.
• You should see the new subheader copy.
• The name of the plan should also just be “Performance”.

Woo Express Performance site

• Upgrade the trial site created previously (or go to an existing Performance plan site).
• Go to /plans/:siteSlug.
• You should see the new subheader copy.
• The name of the plan should also just be “Performance”.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests 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-ajp-p2)?