Unit test for CatalogProductCompareClearObserver

[mmezhensky]

Description (*)

This PR adds unit test that covers Magento\Reports\Observer\CatalogProductCompareClearObserver

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]

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[magento-deployment-service]

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[magento-engcom-team]

Hi @swnsma, thank you for the review.
ENGCOM-6961 has been created to process this Pull Request
✳️ @swnsma, 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-Delta]

Notice: QA not applicable

[engcom-Golf]

Hi @swnsma could you please approve it one more time ?

[m2-assistant]

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