feat(js): support new checkout totals shape #29033

Job	Run time
Check Permissions	5s
Build Packages	1m 3s
Formatting \| Dedupe \| Changeset	53s
Unit Tests (**)	1m 53s
Static analysis	1m 10s
Publish with pkg-pr-new	40s
Unit Tests (**)	2m 12s
Integration Tests (express, chrome)	1m 58s
Integration Tests (sessions, chrome)	2m 17s
Integration Tests (handshake:staging, chrome)	1m 22s
Integration Tests (localhost, chrome)	1m 35s
Integration Tests (tanstack-react-start, chrome)	1m 34s
Integration Tests (fastify, chrome)	1m 56s
Integration Tests (generic, chrome)	5m 21s
Integration Tests (vue, chrome)	1m 58s
Integration Tests (hono, chrome)	1m 37s
Integration Tests (sessions:staging, chrome)	2m 13s
Integration Tests (machine, chrome)	5m 7s
Integration Tests (handshake, chrome)	1m 24s
Integration Tests (nextjs, chrome, 15)	5m 21s
Integration Tests (quickstart, chrome, 15)	2m 10s
Integration Tests (quickstart, chrome, 16)	2m 30s
Integration Tests (ap-flows, chrome)	2m 8s
Integration Tests (custom, chrome)	1m 54s
Integration Tests (nuxt, chrome)	2m 48s
Integration Tests (chrome-extension, chrome)	1m 38s
Integration Tests (react-router, chrome)	1m 57s
Integration Tests (billing, chrome)	3m 53s
Integration Tests (nextjs, chrome, 16)	5m 21s
Integration Tests (astro, chrome)	2m 42s
Integration Tests (cache-components, chrome, 16)	1m 51s
	1h 10m 31s

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