Publishing of Coverage results to SonarCloud

[ValeriyMaslenikov]

To improve the speed of Pull Requests reviews, improve code quality (by make it less difficult to measure the difference between coverage after the changes are introduced we need to publish the code coverage file to SonarCloud, which will result in showing the difference in coverage on Pull Request comment:

Here it's documentation on how to use it along with PHPUnit: https://docs.sonarcloud.io/enriching/test-coverage/python-test-coverage/