[Analytics] Code refactor & covered unit test in Analytics/ReportXml/QueryFactory

[srsathish92]

Description (*)

This PR utilise the existing JSON class instead of PHP json_encode , json_decode, reused the Query Object create method & covered with unit test..

Manual testing scenarios (*)

vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Magento/Analytics/Test/Unit/ReportXml/QueryFactoryTest.php

Questions or comments

If any please let me know your feedback's

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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[ihor-sviziev]

Functional test failures not related to this PR

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-6894 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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