Storage Add-Ons: Display the storage label for multi-year plans

[jeyip]

Related to #79041 (review)

Proposed Changes

This PR fixes a bug where the storage label wasn't being displayed for multi-year plans.

GIF

Testing Instructions

• In calypso live or a local dev environment, navigate to /start/onboarding-pm
• Follow onboarding steps until at the plans page
• Ensure that the selected time interval is 2 years
• Verify that storage labels appear in the

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)?

[matticbot]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-75976

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-75976&env=jetpack

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[ddc22]

LGTM 🚢