tests: capture exceptions that are not caught during the test execution an reraise them. Fixes #2705 #2707
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Exceptions raised during signals don't bubble to the test caller, instead they
get pushed into sys.excepthook which by default prints them.
This adds a pytest plugin which wraps each test (I think..) collects uncaught exceptions
and reraises them at the end.
This uncovers a few bugs, so this makes the tests fail atm.