make sure user packages are not used in sanity check of PythonBundle #3435
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Some PythonBundle ECs (e.g. IPython) use custom sanity checks using python. That might pick up python packages installed to the users
$HOME
which can yield wrong results.We already take care of this for the extensions sanity check in PythonPackage and for installing extensions in PythonBundle.
However for the sanity check of PythonBundle itself the variable is not defined (even if it was defined during the build) as the environment gets reset when loading the module used for the sanity check.
Hence use the same approach used in PythonPackage and set
$PYTHONNOUSERSITE
after loading the module.