fix: add cart counter to Header

[jorgemoya]

What/Why?

Passes in a cart component that renders cart count badge and link. We need this atm because PPR is not enabled and this can fetch the count on static sites where cookie is not enabled.

Testing

Locally.

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Latest commit: f2fe24b5495be3bf0d1ff2c771c5d84b91fa6be1

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