BUG: unittest_tools.py missing from tarball

[boldorider4]

Describe the issue:

The test framework run by pytest requires file tests/unittest_tools.py. Such a file is missing from the tarball downloadable from pypi.

Reproducable code example:

$ tar xvfz pytensor-2.13.1.tar.gz && cd pytensor-2.13.1
$ python -m pip install . -vv --no-deps --no-build-isolation
$ python -m pytest tests/test_breakpoint.py

Error message:

No response

PyTensor version information:

version: 2.13.1
os: linux or macOS

Context for the issue:

No response

[ricardoV94]

Tentative cc @maresb