codegen: 🐛 Fix consistent ordering of units (#1235)

The ordering seemed to vary on computers resulting in annoying diffs for
PRs.
Fixed by specifying the string comparer, assuming the default was
affected by the system's culture.

Verified fix in a recent PR where running codegen locally resulted in a
diff. With this fix, there was no diff.

Author: angularsen

CodeGen/Generators/QuantityJsonFilesParser.cs

@@ -60,7 +60,7 @@ private static Quantity ParseQuantityFile(string jsonFileName)
 
         private static void OrderUnitsByName(Quantity quantity)
         {
-            quantity.Units = quantity.Units.OrderBy(u => u.SingularName).ToArray();
+            quantity.Units = quantity.Units.OrderBy(u => u.SingularName, StringComparer.OrdinalIgnoreCase).ToArray();
         }
 
         private static void FixConversionFunctionsForDecimalValueTypes(Quantity quantity)