Package installs `tests` as top-level `tests` package

Installing `model-index` installs both the `modelindex` package, as well as the tests (as a `tests`) package.

I noticed this after installing the library broke an unrelated test suite since the `tests` package (from modelindex) was shadowing the pytest tests directory.

Looking at the package json file you can see the following paths are installed that should probably be removed:

```
# model-index-0.1.11-pyhd8ed1ab_1.json, lines 45:56
"lib/python3.12/site-packages/tests/__init__.py",
"lib/python3.12/site-packages/tests/test_check.py",
"lib/python3.12/site-packages/tests/test_cli.py",
"lib/python3.12/site-packages/tests/test_collections.py",
"lib/python3.12/site-packages/tests/test_examples.py",
"lib/python3.12/site-packages/tests/test_images.py",
"lib/python3.12/site-packages/tests/test_import.py",
"lib/python3.12/site-packages/tests/test_library.py",
"lib/python3.12/site-packages/tests/test_markdown.py",
"lib/python3.12/site-packages/tests/test_singlefile.py",
"lib/python3.12/site-packages/tests/test_str.py",
"lib/python3.12/site-packages/tests/test_yml_head.py",
```