RN: Improve Error for Invalid processFilter Values (#46271)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46271

Improves the error thrown when an invalid value is supplied to `processFilter`. Without this, the error thrown would look something like:

> TypeError: … is not iterable

Changelog:
[General][Changed] - Improved error message for invalid filter values

Reviewed By: jorge-cab

Differential Revision: D62011191

fbshipit-source-id: 5594eeaf2b9174af14cc9e4daa275ae72974e597

packages/react-native/Libraries/StyleSheet/processFilter.js

@@ -82,7 +82,7 @@ export default function processFilter(
         }
       }
     }
-  } else {
+  } else if (Array.isArray(filter)) {
     for (const filterFunction of filter) {
       const [filterName, filterValue] = Object.entries(filterFunction)[0];
       if (filterName === 'dropShadow') {
@@ -109,6 +109,8 @@ export default function processFilter(
         }
       }
     }
+  } else {
+    throw new TypeError(`${typeof filter} filter is not a string or array`);
   }
 
   return result;