Unit test for UpdateElementTypesObserver

[mmezhensky]

Description (*)

This PR adds unit test that covers Magento\Weee\Observer\UpdateElementTypesObserver

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

Hi @eduard13, thank you for the review.
ENGCOM-6987 has been created to process this Pull Request

[engcom-Delta]

Notice: QA not applicable

[engcom-Charlie]

@magento run all tests

[m2-assistant]

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