Go back to the old spelling of NumberFormatPartTypes to not break DT (#45889)

Author: Orta Therox

src/lib/es2018.intl.d.ts

@@ -40,10 +40,10 @@ declare namespace Intl {
     // We can only have one definition for 'type' in TypeScript, and so you can learn where the keys come from here:
     type ES2018NumberFormatPartType = "literal" | "nan" | "infinity" | "percent" | "integer" | "group" | "decimal" | "fraction" | "plusSign" | "minusSign" | "percentSign" | "currency" | "code" | "symbol" | "name";
     type ES2020NumberFormatPartType = "compact" | "exponentInteger" | "exponentMinusSign" | "exponentSeparator" | "unit" | "unknown";
-    type NumberFormatPartType = ES2018NumberFormatPartType | ES2020NumberFormatPartType;
+    type NumberFormatPartTypes = ES2018NumberFormatPartType | ES2020NumberFormatPartType;
 
     interface NumberFormatPart {
-        type: NumberFormatPartType;
+        type: NumberFormatPartTypes;
         value: string;
     }