fix "parent" products sku inconsistency with product_id

[engcom-Charlie]

Description (*)

Fixed and covered by test.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes REST API order info -> "parent" products sku inconsistency with product_id  #21231

Manual testing scenarios (*)

See #21231

Questions or comments

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)
• All automated tests passed successfully (all builds are green)

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[engcom-Charlie]

@magento run all tests

[ihor-sviziev]

@engcom-Charlie I think it should be fixed together with #25461, seems to me quite related.

[orlangur]

@magento run all tests

[orlangur]

it should be fixed together with #25461, seems to me quite related.

not really as of #25461 (reference)

[ihor-sviziev]

@engcom-Charlie could you re-target this PR to 2.5-develop branch?