Refactor scripts arguments handling (#456)

- remove the use of environment variables to get directory paths,
- make use of arguments / argparse instead of environment variables in `update.py` and `report.py`,
- automatically guess the data directory in `latest.py` based on the script's location,
- propagate log level to auto scripts,
- move `list_configs_from_argv` from `endoflife` module to `releasedata` module,
- use `list_products` in `latest.py` to load the product's frontmatters.

.github/workflows/update.yml

@@ -61,7 +61,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         continue-on-error: true # commit even if the data was not fully updated
-        run: python update.py
+        run: python update.py -p 'website/products'
 
       - name: Commit changes
         uses: stefanzweifel/git-auto-commit-action@v6