CF Preview URL: Extract worker URL and run visual tests

[SamyPesse]

This PR improves the deployment of the v2 to Cloudflare to correctly extract the worker preview URL until cloudflare/wrangler-action#356 is shipped.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 523da65

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://d0b6b07e.gitbook-open.pages.dev	✅
PR	https://pr3132.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-yjbmf7a12-gitbook.vercel.app	✅
Cloudflare	https://ac84e029-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://d0b6b07e.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-yjbmf7a12-gitbook.vercel.app/url/docs.gitbook.com	https://ac84e029-gitbook-open-v2-preview.gitbook.workers.dev/url/docs.gitbook.com
E2E	https://d0b6b07e.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-yjbmf7a12-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://ac84e029-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Apr 9, 2025, 4:13 PM
customers-v2 (Inspect)	✅ No changes detected	-	Apr 9, 2025, 4:16 PM
default (Inspect)	✅ No changes detected	-	Apr 9, 2025, 4:15 PM
v2-vercel (Inspect)	✅ No changes detected	-	Apr 9, 2025, 4:15 PM