refactor(core): Make unsupported styling type error message clearer

The previous message would sound like a full sentence when using a signal without `()` (Example: Unsupported styling type function: [Input Signal: neutral]). The new formatting makes it a bit more obvious that the type itself is the problem.

packages/core/src/render3/instructions/styling.ts

@@ -692,7 +692,7 @@ export function toStylingKeyValueArray(
     stringParser(styleKeyValueArray, unwrappedValue);
   } else {
     ngDevMode &&
-      throwError('Unsupported styling type ' + typeof unwrappedValue + ': ' + unwrappedValue);
+      throwError('Unsupported styling type: ' + typeof unwrappedValue + ' (' + unwrappedValue + ')');
   }
   return styleKeyValueArray;
 }