Fix regional caching of tag cache

[conico974]

The regional tag cache was kind of broken.
If one tag was revalidated and some cache entry using it was updated, it would make other cache entry depending on that tag cache thinks that they were not stale.

It was very visible for customization update on a multi section website.

Still need some test (especially deployed), and ideally we'd need to find a way to test this in an e2e test.

Link to the OpenNext PR opennextjs/opennextjs-cloudflare#820

[linear]

RND-7743 `getPublishedContentSite` data cache broken in GBO 2c

[changeset-bot]

⚠️ No Changeset found

Latest commit: 46d5375

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-825yes9bn-gitbook.vercel.app	✅
Cloudflare	https://706f95dc-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-825yes9bn-gitbook.vercel.app/url/gitbook.com/docs	https://706f95dc-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-825yes9bn-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://706f95dc-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	3 changed	Jul 29, 2025, 10:34 AM
v2-cloudflare (Inspect)	👍 Changes approved	1 changed	Jul 29, 2025, 10:39 AM
v2-vercel (Inspect)	✅ No changes detected	-	Jul 29, 2025, 10:36 AM