fix: set NoEcho flag on OAuth creds CFN param

Author: edwardfoyle

packages/amplify-category-auth/src/__tests__/provider-utils/awscloudformation/auth-stack-builder/__snapshots__/auth-stack-transform.test.ts.snap

@@ -788,6 +788,7 @@ Object {
       "Type": "String",
     },
     "hostedUIProviderCreds": Object {
+      "NoEcho": true,
       "Type": "String",
     },
     "hostedUIProviderMeta": Object {

packages/amplify-category-auth/src/provider-utils/awscloudformation/auth-stack-builder/auth-stack-transform.ts

@@ -485,6 +485,16 @@ export class AmplifyAuthTransform extends AmplifyCategoryTransform {
     }
 
     for (const [key, value] of Object.entries(props)) {
+      if (key === 'hostedUIProviderCreds') {
+        this._authTemplateObj.addCfnParameter(
+          {
+            type: 'String',
+            noEcho: true,
+          },
+          key,
+        );
+        continue;
+      }
       if (typeof value === 'string' || (typeof value === 'object' && !Array.isArray(value))) {
         this._authTemplateObj.addCfnParameter(
           {