Applied gift card

[wizardlyhel]

WHY are these changes introduced?

• Add the newly introduced cartGiftCardCodesUpdate mutation to cartCreateHandler
• Update skeleton template to handle gift card codes

Todo

• Update example code

WHAT is this pull request doing?

HOW to test your changes?

1. Go to admin and create a couple gift cards, these code are one-time view only so keep a copy it of it.
2. Run skeleton template and add an item to cart
3. Add gift card codes
4. Go to checkout and see they are applied

Post-merge steps

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[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.

[shopify]

Oxygen deployed a preview of your hl-applied-gift-cards branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 7:47 PM

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