feat(js): support new checkout totals shape #29022

Job	Run time
Check Permissions	6s
Build Packages	1m 11s
Formatting \| Dedupe \| Changeset	56s
Static analysis	1m 34s
Unit Tests (**)	2m 31s
Publish with pkg-pr-new	1m 2s
Unit Tests (**)	2m 7s
Integration Tests (handshake, chrome)	1m 38s
Integration Tests (sessions:staging, chrome)	2m 36s
Integration Tests (ap-flows, chrome)	1m 47s
Integration Tests (handshake:staging, chrome)	1m 27s
Integration Tests (vue, chrome)	1m 55s
Integration Tests (express, chrome)	1m 36s
Integration Tests (localhost, chrome)	1m 40s
Integration Tests (hono, chrome)	1m 56s
Integration Tests (fastify, chrome)	1m 28s
Integration Tests (nuxt, chrome)	2m 37s
Integration Tests (react-router, chrome)	1m 30s
Integration Tests (quickstart, chrome, 16)	2m 2s
Integration Tests (cache-components, chrome, 16)	1m 47s
Integration Tests (nextjs, chrome, 15)	6m 11s
Integration Tests (custom, chrome)	2m 16s
Integration Tests (sessions, chrome)	2m 52s
Integration Tests (billing, chrome)	4m 33s
Integration Tests (nextjs, chrome, 16)	5m 17s
Integration Tests (machine, chrome)	5m 35s
Integration Tests (tanstack-react-start, chrome)	1m 31s
Integration Tests (chrome-extension, chrome)	1m 39s
Integration Tests (quickstart, chrome, 15)	2m 23s
Integration Tests (generic, chrome)	5m 48s
Integration Tests (astro, chrome)	3m 11s
	1h 14m 42s

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