Improve detection of code path not supported in v2, add visual tests

[SamyPesse]

It also fixes code highlighting regressing because of Biome.

[changeset-bot]

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Latest commit: e5430ec

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[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit	https://ae3363d5.gitbook-open.pages.dev	✅
PR	https://pr2884.gitbook-open.pages.dev	✅

Version 2 (experimental)

Version	URL	Status
Vercel	https://gitbook-v2-c199hm8gr-gitbook.vercel.app	✅
Cloudflare		✅

Test content

Site	v1	v2
GitBook	https://ae3363d5.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-c199hm8gr-gitbook.vercel.app/url/docs.gitbook.com
E2E	https://ae3363d5.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-c199hm8gr-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers (Inspect)	👍 Changes approved	4 changed	Feb 26, 2025, 7:09 PM
customers-v2 (Inspect)	🔘 Orphan build (Review)	180 added, 2 failures	Feb 26, 2025, 7:10 PM
default (Inspect)	⚠️ Changes detected (Review)	5 changed	Feb 26, 2025, 7:11 PM
v2 (Inspect)	🔘 Orphan build (Review)	16 added, 159 failures	Feb 26, 2025, 7:49 PM