Don't filter product options with only one value in the VariantSelector

[blittle]

WHY are these changes introduced?

We are in the process of simplifying and improving the components offered by Hydrogen. As a part of that, it's been requested that the VariantSelector component be changed to not filter out options that have only one value. This is a breaking change.

See the changeset for an example on how to migrate.

Fixes #1198

HOW to test your changes?

1. Make sure that the skeleton template does not display product options for a product that does not have more than one value. For example: /products/shopify-wax

Post-merge steps

Checklist

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

[shopify[bot]]

Oxygen deployed a preview of your bl-variant-selector-filter branch. Details:	Storefront	Status	Preview link	Deployment details	Last update (UTC)
subscriptions	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:10 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:10 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:10 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:10 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:11 PM
vite	✅ Successful (Logs)	Preview deployment	Inspect deployment	May 14, 2024 8:10 PM

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[blittle]

Okay, I'll hold off merging.