composite-checkout: add missing cart events

[nbloomf]

Changes proposed in this Pull Request

• Adds calypso_cart_product_add and calypso_cart_product_remove events to composite checkout.

Testing instructions

Enter checkout, proceed to the review order step, and remove an item from your cart. Verify that the tracks events fire.

[matticbot]

Test live: https://calypso.live/?branch=add/cart-tracks-events-to-composite-checkout

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~136 bytes added 📈 [gzipped])

name      parsed_size           gzip_size
checkout       +660 B  (+0.0%)     +136 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[lancewillett]

GitHub workflow note — please use status labels as much as you can. There is automation available with GitHub project boards. Moving it between columns changes the status for you, etc.

What's the status of this one — Needs Review maybe?

[github-actions]

This PR has been marked as stale due to lack of activity within the last 30 days.