Allow profile namespaces to use new storage design

What does this MR do and why?

This is a follow-up to #350646 (closed), it shows the new storage design for user profiles (it was missing from the original MR).

The namespace will show new design if is_free_namespace is true and update_storage_usage_design feature flag is true.

Screenshots or screen recordings

before	after

How to set up and validate locally

• Enable update_storage_usage_design feature flag from rails console
• Visit your free profile > Usage Quotas > Storage tab

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #362523