fix(amplify-provider-awscloudformation): fixes rest client generation (…

…#6180)

Adds Flutter to Javascript for rest client file generation exclusions

Co-authored-by: Noyes <dnnoyes@f8ffc25e9e15.ant.amazon.com>

packages/amplify-provider-awscloudformation/src/download-api-models.ts

@@ -10,7 +10,7 @@ export async function downloadAPIModels(context: $TSContext, allResources) {
 
   const framework = projectConfig.frontend;
 
-  if (framework === 'javascript') {
+  if (['javascript', 'flutter'].includes(framework)) {
     return;
   }