fix: show tax total in all summaries

[aldeed]

Impact: minor
Type: bugfix

Issue

Only 1 of the 4 places where CartSummary is used was showing the taxTotal amount. The others always showed -.

Solution

Now all summaries show the tax amount

Breaking changes

n/a

Testing

Must be tested against refactor-aldeed-split-tax-rates-plugin branch of Reaction API until it is merged.

1. Configure and enable a tax service in Reaction operator UI.
2. Configure a product variant to be taxable and have a taxable tax code.
3. Add that product variant to your cart in starter kit storefront.
4. Go to checkout and enter a shipping address.
5. Verify that a tax amount shows in the summary on the right
6. Go to /cart and verify that a tax amount shows there.
7. Go back to checkout and finish checking out. Verify that a tax amount shows on the order summary after the order is placed.

[nnnnat]

LGTM! 👍