H2O compatibility date

[frandiox]

Let Hydrogen specify a compatibility date for Oxygen workers:

• In dev, it passes the compat date to MiniOxygen.
• It generates oxygen.json file at build time, which will be uploaded to Oxygen.

The date, for now, comes from Hydrogen version (calver): 2024.7.5 (the last number is the patch release, not a day) becomes 2024-07-01, always using the first day of the month. This will change to 2024-10-01 when we release the new major in October.

The format of oxygen.json is: {"version": 1, "compatibilityDate": "2024-07-01"}

[shopify]

Oxygen deployed a preview of your fd-h2o-compat branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:00 AM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:00 AM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:01 AM
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:00 AM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:00 AM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 31, 202411:00 AM

Learn more about Hydrogen's GitHub integration.

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset.
If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG.
If you are making simple updates to examples or documentation, you do not need to add a changeset.

[frandiox]

This is ready for review, although not for merging yet. Let's wait until Oxygen supports this (hopefully for our 2024-10 major release).