This issue is automatically created based on existing pull request: #39772: [Graphql] applied_to must exist on an orderItem

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Description (*)

Due to

discount being used in order_item applied_to MUST be present if a discount is present.

Because this is missing errors will be thrown once the applied_to is missing. There are 2 ways to fix this. Remove the not null requirement on applied_to or adding the applied_to on the order item as well.
I believe adding it to the order item could result in more consistent frontend as we keep the data between cart item and order item te same.

Manual testing scenarios (*)

Create/fetch an order using Graphql that has orderitems with discounts, make sure to get the discounts and applied_to (as defined by the graphql schema).
You will see the following error

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)