[Backport] Make configfixture meaningful in ProcessCronQueueObserverTest

[ronak2ram]

Original Pull Request

#16253

Description

Filter test result collection with the cron job code defined in the config fixture. Set the schedule for every minute so that the job is scheduled regardless of the time when you run the test.

Fixed Issues (if relevant)

1. Integration test ProcessCronQueueObserverTest.php succeeds regardless of magento config fixture #16243

Manual testing scenarios

1. run dev/tests/integration/testsuite/Magento/Cron/Observer/ProcessCronQueueObserverTest.php

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 on Travis CI are green)

[magento-engcom-team]

Hi @ronak2ram. Thank you for your contribution
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