golang: tests: Add tests for IPython and Pytest integration patches
bb9a94c3 (golang: Teach defer to chain exceptions (PEP 3134) even on Python2) added integration patches for IPython and Pytest to properly dump tracebacks for chained exceptions even on Python2. However the functionality of patches was tested only manually. -> Add corresponding tests to verify how IPython and Pytest behaves when dumping tracebacks.
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