fix(core, web): resolve type error in release mode (#17123)

Author: SelaseKay

packages/firebase_core/firebase_core_web/lib/src/firebase_core_web.dart

@@ -202,8 +202,13 @@ class FirebaseCoreWeb extends FirebasePlatform {
   List<FirebaseAppPlatform> get apps {
     try {
       return firebase.apps.map(_createFromJsApp).toList(growable: false);
-    } catch (exception) {
-      if (exception.toString().contains('of undefined')) {
+    } catch (exception, stackTrace) {
+      final exceptionMessage = exception.toString();
+      final stackTraceMessage = stackTrace.toString();
+      const undefinedError = 'of undefined';
+
+      if (exceptionMessage.contains(undefinedError) ||
+          stackTraceMessage.contains(undefinedError)) {
         // Keeps behavior consistent with other platforms which can access list without initializing app.
         return [];
       } else {