Add currency to pricing page and checkout page view tracks

[CodeyGuyDylan]

Proposed Changes

• Add currency prop to page views on the pricing page and checkout

Why are these changes being made?

We don't currently have currency tracked on these page views

Testing Instructions

1. Open the Calypso Blue live link
2. Go to /checkout/jetpack/jetpack_complete
3. In tracks vigilante, or wherever you look at tracks, find the calypso_checkout_page_view event and ensure the currency prop is present
   
4. Open the Calypso Green live link
5. Go to /pricing
6. Find the calypso_jetpack_pricing_page_visit event and ensure currency is tracked
   

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-128303

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-128303&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-128303&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/currency-to-pricing-page-and-checkout-page-views on your sandbox.

[matticbot]

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

Sections (~56 bytes added 📈 [gzipped])

name                   parsed_size           gzip_size
plans                        +95 B  (+0.0%)      +47 B  (+0.0%)
jetpack-connect              +95 B  (+0.0%)      +47 B  (+0.0%)
jetpack-cloud-pricing        +95 B  (+0.0%)      +47 B  (+0.0%)
checkout                     +26 B  (+0.0%)       +9 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.

Async-loaded Components (~9 bytes added 📈 [gzipped])

name                                             parsed_size           gzip_size
async-load-calypso-my-sites-checkout-modal             +26 B  (+0.0%)       +9 B  (+0.0%)
async-load-calypso-blocks-editor-checkout-modal        +26 B  (+0.0%)       +9 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

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.

[sirbrillig]

No objection to the checkout part of this! I can't speak to the Jetpack plans page part.

[elliottprogrammer]

Tested, works good. Code looks good.
LGTM! 👍