Testing: MayaPy Default

[tokejepsen]

Changelog Description

This makes MayaPy the default application group to test when running tests for Maya.

Major change for testing is piping stdout and stderr to files, which should work for non-Python hosts as well.

Split from #5644

Testing notes:

openpype_console runtests C:\Users\tokejepsen\OpenPype\tests\integration\hosts\maya\test_publish_in_maya.py --mongo_url "mongodb://localhost:2707/"

openpype_console runtests C:\Users\tokejepsen\OpenPype\tests\integration\hosts\maya\test_publish_in_maya.py --app_group maya --mongo_url "mongodb://localhost:2707/"

[iLLiCiTiT]

If changes in applications.py are only because of testing then I don't agree with them, until you explain them very clearly. The handling of stdout and stderr is there because of Windows UI build (openpype_gui) which has different handling and stdout/strderr of the launched subprocess.

[tokejepsen]

@iLLiCiTiT I've reverted the logic of the stdout and stderr when sys.stdout is None now. Could you have another look?

[mkolar]

Because we're splitting OpenPype into ayon-core and individual host addons, this PR would have to be re-created to target one of those.

We're closing it down, but we'll he happy for a new PR to ynput/ayon-core or the host addon repository once it's up.