[GiftMessage] Covering the SalesEventOrderToQuoteObserver by Unit Test

[eduard13]

Description (*)

This PR adds missing unit tests for the following class:

• \Magento\GiftMessage\Observer\SalesEventOrderToQuoteObserver

Fixed Issues (if relevant)

N/A

Manual testing scenarios (*)

N/A

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)

[m2-assistant]

Hi @eduard13. Thank you for your contribution
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[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-6217 has been created to process this Pull Request
✳️ @dmytro-ch, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

Hi @eduard13, thank you for your contribution!
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