Extension Attributes will add for Order Items

[Vasudev-22]

Description (*)

Already for Order Extension attributes are adding, but for Order Item, it was not added. This fixes is for adding the extension attributes to Order Item Collection .

Related Pull Requests

Fixes for #14623

Fixed Issues (if relevant)

1. Fixes Join extension attributes are not added to Order and Order Items #14623

Manual testing scenarios (*)

1. Add plugin and extension_attributes.xml to see the result in Rest API collection.

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)
• 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)

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

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[Vasudev-22]

@magento run all tests

[Vasudev-22]

@magento run all tests