[Security Solution] Enable upload feature flag (#159843)

## Summary

Enable upload response action feature flag for the `8.9` release 


### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

x-pack/plugins/security_solution/common/experimental_features.ts

@@ -69,7 +69,7 @@ export const allowedExperimentalValues = Object.freeze({
   /**
    * Enables the `upload` endpoint response action (v8.9)
    */
-  responseActionUploadEnabled: false,
+  responseActionUploadEnabled: true,
 
   /**
    * Enables top charts on Alerts Page

x-pack/plugins/security_solution/public/management/components/endpoint_responder/lib/integration_tests/console_commands_definition.test.tsx

@@ -65,6 +65,7 @@ describe('When displaying Endpoint Response Actions', () => {
       'suspend-process --pid',
       'get-file --path',
       'execute --command',
+      'upload --file',
     ]);
   });
 });

x-pack/plugins/security_solution/public/management/pages/response_actions/view/response_actions_list_page.test.tsx

@@ -423,7 +423,7 @@ describe('Response actions history page', () => {
       });
 
       expect(history.location.search).toEqual(
-        '?commands=isolate%2Crelease%2Ckill-process%2Csuspend-process%2Cprocesses%2Cget-file%2Cexecute'
+        '?commands=isolate%2Crelease%2Ckill-process%2Csuspend-process%2Cprocesses%2Cget-file%2Cexecute%2Cupload'
       );
     });