fix(ci): address linter failures and netlify config issues

- Reformat setup.py entry_points for Black compliance and Flake8 line length.
- Synchronize and fix formatting for _headers and _redirects in root and next-app/public/.
- Ensure exactly one trailing newline and no trailing spaces in Netlify config files.

Co-authored-by: OneFineStarstuff <87420139+OneFineStarstuff@users.noreply.github.com>

Author: google-labs-jules[bot]

setup.py

@@ -17,5 +17,9 @@
         "nest_asyncio",
     ],
     extras_require={"governance": ["jsonschema"]},
-    entry_points={"console_scripts": ["validate-gsifi-governance-assets=scripts.validate_gsifi_governance_assets:main"]},
+    entry_points={
+        "console_scripts": [
+            "validate-gsifi-governance-assets=scripts.validate_gsifi_governance_assets:main"
+        ]
+    },
 )