added lost datapoints from graphql migration

[eekpo1]

Description of change

During the migration of the deprecated rest API for the product and inventory items streams, the initial schemas for the graphql streams had omitted some fields. This PR will add in the omitted fields back using their updated aliases in the shopify product_variant graphql endpoint:

• weight -> inventoryItem.measurement.weight.(unit|value)
• fulfillment_service -> inventoryItem.inventoryLevel.location.fulfillmentService.handle

QA steps

• [ x] manual qa steps passing (list below)
  • discovery and sync successful with new fields marked as available

Risks

graphql mapping names not properly spelled, thus returning null values or errors based on field name.

Rollback steps

• revert this branch

AI generated code

https://internal.qlik.dev/general/ways-of-working/code-reviews/#guidelines-for-ai-generated-code

• this PR has been written with the help of GitHub Copilot or another generative AI tool