Python coverage

Upgrading rules_python in Bazel and running tests again version 0.36.0 showed problems with coverage support.

To reproduce run `bazel test //src/test/shell/bazel:bazel_coverage_hermetic_py_test` from Bazel repository. It fails saying the test has failed, but this previously with builtin Python rules wasn't the case.

I went down the rabbit hole, but I couldn't figure it out. I think that this test should be moved out of Bazel into rules_python, if it isn't already.

Reproduce el fallo con `bazel test //src/test/shell/bazel:bazel_coverage_hermetic_py_test` desde el repositorio de Bazel. Lee la prueba de coverage existente y el soporte de coverage de rules_python para determinar si la prueba corresponde aquí o en rules_python. Se considera terminado cuando la prueba tiene un lugar claro y el comportamiento de coverage ya no informa del fallo inesperado.

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