infra: add a twine check before uploading to pypi (datafusion-contrib#183)

`twine check --strict` would have caught the lack of README 
Context:
datafusion-contrib#172 (comment)

Example,
PyO3/maturin-action#166 (comment)

### Testing
Github action run on my fork shows that `twine check` fails
https://github.com/kevinjqliu/tpchgen-rs/actions/runs/17332990961
Because datafusion-contrib#182 has not been applied yet 

Tested locally, with and without fix from datafusion-contrib#182:
```
maturin sdist                                                                               
twine check --strict <.tar.gz>
```

```
maturin build --release
twine check --strict <.wheel>
```

Author: kevinjqliu

.github/workflows/tpchgen-cli-publish-pypi.yml

@@ -139,10 +139,18 @@ jobs:
       attestations: write # Used to generate artifact attestation
     steps:
       - uses: actions/download-artifact@v4
+
+      - name: Install twine
+        run: pip install twine
+
+      - name: Check distributions with twine
+        run: twine check --strict wheels-*/*
+
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v2
         with:
           subject-path: 'wheels-*/*'
+
       - name: Publish to PyPI
         uses: PyO3/maturin-action@v1
         with: