[Cookie] Fix PHPUnit 8 compatibility issues

[srsathish92]

Description (*)

This PR fixes the PHPUnit 8 compatibility issues of existing unit tests for Magento_Cookie module.

Related Pull Requests

N/A

Fixed Issues (if relevant)

1. Unit Tests incompatible with PHPUnit 8 #27500

Manual testing scenarios (*)

1. Run tests in phpunit 6 (currently in 2.4-develop) using vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Magento/Cookie/
2. Install phpunit 8, run tests using vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Magento/Cookie/

Questions or comments

If any please let me know your feedback

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 @srsathish92. Thank you for your contribution
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[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-7287 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

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[m2-assistant]

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