fix: 🐛 Remove json_object from payload for non-json credentials (#1576)

* fix: 🐛 Remove json_object from payload for non-json credentials

* refactor: 💡 update new route logic for type specific attributes

* test: 💍 remove typeIn and use fillIn for json credential test

ui/admin/app/routes/scopes/scope/credential-stores/credential-store/credentials/new.js

@@ -29,23 +29,28 @@ export default class ScopesScopeCredentialStoresCredentialStoreCredentialsNewRou
       'scopes.scope.credential-stores.credential-store'
     );
     let name, description;
-    /**
-     * this sets the credential attribute json_object to a string that
-     * replicates an empty json blob as CodeMirror expects a string
-     */
-    const json_object = '{}';
 
     if (this.currentModel?.isNew) {
       ({ name, description } = this.currentModel);
       this.currentModel.rollbackAttributes();
     }
 
+    /**
+     * this sets the credential attribute json_object to a string that
+     * replicates an empty json blob as CodeMirror expects a string
+     */
+    const typeSpecificAttrs = {};
+    switch (type) {
+      case 'json':
+        typeSpecificAttrs.json_object = '{}';
+    }
+
     return this.store.createRecord('credential', {
       type,
       credential_store_id,
       name,
       description,
-      json_object,
+      ...typeSpecificAttrs,
     });
   }