Cherry-pick #16883 to 7.x: Use pytest instead of nosetests #20478
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Cherry-pick of PR #16883 to 7.x branch. Original message:
What does this PR do?
Replaces nosetests with pytest.
Why is it important?
Nosetests has been in maintenance mode for years, its last release was done in 2015. When evolving the testing framework for Python tests it would be better to do it based on a maintained test tool. It will stop working with Python 3.9.
For #15891 I am considering adding new features to the testing framework that could include to add some plugin for the test tool, it wouldn't make sense to implement code based on a discontinued tool.
Pytest is a complete and well maintained test tool, it is one of the tools recommended after cease of nose project and it can be used as a direct replacement.
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