test(console/commands/init): package include (#6352)

Add test for generating "packages" in pyproject.toml.
Originally implemented in this commit:

https://github.com/python-poetry/poetry/commit/85f922dfddb8d8e61408b5d8e53f3bffb6beb2b3



Co-authored-by: Arun Babu Neelicattu <arun.neelicattu@gmail.com>