unittests: allow running with pytest/unittest directly

Currently the unittests are not runnable with pytest or unittest
without going through the run_unittests.py wrapper, or setting
certain env vars like MESON_UNIT_TEST_BACKEND.

This has that downside that the common "pytest ..." fails and integration
with things like VSCode fails too.

To work around that we set everything that is needed to run the tests
in __init__.py and run_unittests is only one more variant to invoke them
by providing different defaults and settings.

To make sure that pytest/unittest discover and run_unittests don't diverge
implement an automatic test discovery in run_unittests to avoid hardcoding
the tests to run there. There shouldn't be any functional changes.

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