Add plugin for SalesOrderItemRepository gift message (#19093)

[lfolco]

Description (*)

Include orderitem-level gift messages in REST API.

Fixed Issues (if relevant)

1. API: salesOrderItemRepository does not include gift message #19093: API: salesOrderItemRepository does not include gift message

Manual testing scenarios (*)

1. Create order with orderitem-level gift message
2. Call REST API `http://<base_url>/rest/V1/orders/items/<order_id>
3. Confirm gift message is included in extension attributes

Questions or comments

This was already done in a previous pull request, but never finished.

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)

[m2-assistant]

Hi @lfolco. Thank you for your contribution
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[kalpmehta]

@magento give me test instance

[magento-engcom-team]

Hi @kalpmehta. Thank you for your request.
Unfortunately, I can only deploy instances for 2.2-develop and 2.3-develop base branches

[kalpmehta]

Hi @lfolco, thanks for your contribution! Can you please check WebAPI failing test?

[lfolco]

Hi @lfolco, thanks for your contribution! Can you please check WebAPI failing test?

All tests are passing now.

[magento-engcom-team]

Hi @kalpmehta, thank you for the review.
ENGCOM-6540 has been created to process this Pull Request

[engcom-Delta]

✔️ QA passed

[m2-assistant]

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