Exclude tests from packages

[musicinmybrain]

Before:

$ python3 setup.py bdist
$ tar -tzf dist/py-tes-0.4.2.linux-x86_64.tar.gz
./
./usr/
./usr/local/
./usr/local/lib/
./usr/local/lib/python3.12/
./usr/local/lib/python3.12/site-packages/
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/PKG-INFO
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/SOURCES.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/dependency_links.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/requires.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/top_level.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/zip-safe
./usr/local/lib/python3.12/site-packages/tes/
./usr/local/lib/python3.12/site-packages/tes/__init__.py
./usr/local/lib/python3.12/site-packages/tes/__pycache__/
./usr/local/lib/python3.12/site-packages/tes/__pycache__/__init__.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/client.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/models.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/utils.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/client.py
./usr/local/lib/python3.12/site-packages/tes/models.py
./usr/local/lib/python3.12/site-packages/tes/utils.py
./usr/local/lib/python3.12/site-packages/tests/
./usr/local/lib/python3.12/site-packages/tests/__init__.py
./usr/local/lib/python3.12/site-packages/tests/__pycache__/
./usr/local/lib/python3.12/site-packages/tests/__pycache__/__init__.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tests/__pycache__/test_client.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tests/__pycache__/test_models.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tests/__pycache__/test_utils.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tests/test_client.py
./usr/local/lib/python3.12/site-packages/tests/test_models.py
./usr/local/lib/python3.12/site-packages/tests/test_utils.py

After:

./
./usr/
./usr/local/
./usr/local/lib/
./usr/local/lib/python3.12/
./usr/local/lib/python3.12/site-packages/
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/PKG-INFO
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/SOURCES.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/dependency_links.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/requires.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/top_level.txt
./usr/local/lib/python3.12/site-packages/py_tes-0.4.2-py3.12.egg-info/zip-safe
./usr/local/lib/python3.12/site-packages/tes/
./usr/local/lib/python3.12/site-packages/tes/__init__.py
./usr/local/lib/python3.12/site-packages/tes/__pycache__/
./usr/local/lib/python3.12/site-packages/tes/__pycache__/__init__.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/client.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/models.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/__pycache__/utils.cpython-312.pyc
./usr/local/lib/python3.12/site-packages/tes/client.py
./usr/local/lib/python3.12/site-packages/tes/models.py
./usr/local/lib/python3.12/site-packages/tes/utils.py