Breaking changes in several ProductVariant related mutations in version 2024-10

As of GraphQL Admin API version 2024-10 we're deprecating several singular variant mutations in favor of their bulk version, namely:

• productVariantCreate. Use the productVariantsBulkCreate instead.
• productVariantUpdate. Use the productVariantsBulkUpdate instead.
• productVariantDelete. Use the productVariantsBulkDelete instead.