Metafield description input field removal

The description field on metafield is being removed from the MetafieldInput GraphQL input object. The change will appear in unstable and will be included in the 2025-07 API version.

The description field is optional and isn't exposed to merchants. You can safely stop including the field in queries and mutations.

If you want to set or get the description of a metafield, use the description field on MetafieldDefinition.