Add changelog for preview changes (#4251)

I tweaked rooster to allow sections to be overridden from the CLI so we
can generate a separate preview changelog

See https://github.com/zanieb/rooster/pull/43 for the rooster changes
needed

I tested `./scripts/release.sh` as well.

scripts/release.sh

@@ -9,7 +9,17 @@ project_root="$(dirname "$script_root")"
 
 echo "Updating metadata with rooster..."
 cd "$project_root"
-uv tool run --from rooster-blue --isolated -- rooster release "$@"
+
+# Update the preview changelog
+uv tool run --from 'rooster-blue>=0.0.7' --isolated -- \
+    rooster release "$@" \
+    --only-sections preview \
+    --changelog-file CHANGELOG-PREVIEW.md \
+    --no-update-pyproject --no-update-version-files
+
+# Update the real changelog
+uv tool run --from 'rooster-blue>=0.0.7' --isolated -- \
+    rooster release "$@" --without-sections preview
 
 echo "Updating lockfile..."
 cargo update -p uv