Update storage statistics card for namespaces under project limits

What does this MR do and why?

This is the First MR of a series of improvements to the Usage Quotas page for namespaces under Project Limits Enforcement. More details in https://gitlab.com/gitlab-org/gitlab/-/issues/419922

MR description	MR Link
Update storage statistics card for namespaces under project limits	👈 you're here
Move total-storage-available-breakdown-card to its own component	!128897 (merged)
Add purchased storage available breakdown card for namespaces under project limits	!129757 (merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Visit Namespace Usage quotas in https://gdk.test:3443/groups/<your group here>/-/usage_quotas#storage-quota-tab

MR acceptance checklist

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