[Fleet] Make sure null checks are included for agentless next steps tile (#211068)

## Summary

Closes https://github.com/elastic/security-team/issues/11870

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] [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
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Nicolas Chaulet <nicolas.chaulet@elastic.co>

x-pack/platform/plugins/shared/fleet/public/components/agentless_enrollment_flyout/next_steps.tsx

@@ -88,12 +88,12 @@ export const NextSteps = ({
     });
 
   const connectorCards = packagePolicy.inputs
-    .filter((input) => !!input?.vars?.connector_id.value || !!input?.vars?.connector_name.value)
+    .filter((input) => !!input?.vars?.connector_id?.value || !!input?.vars?.connector_name?.value)
     .map((input, index) => {
       return (
         <EuiFlexItem key={index}>
           <EuiCard
-            data-test-subj={`agentlessStepConfirmData.connectorCard.${input?.vars?.connector_name.value}`}
+            data-test-subj={`agentlessStepConfirmData.connectorCard.${input?.vars?.connector_name?.value}`}
             title={`${input?.vars?.connector_name.value}`}
             description={i18n.translate(
               'xpack.fleet.agentlessStepConfirmData.connectorCard.description',
@@ -103,8 +103,8 @@ export const NextSteps = ({
             )}
             onClick={() => {
               application.navigateToApp(ELASTICSEARCH_PLUGIN_ID, {
-                path: input?.vars?.connector_id.value
-                  ? `content/connectors/${input?.vars?.connector_id.value}`
+                path: input?.vars?.connector_id?.value
+                  ? `content/connectors/${input?.vars?.connector_id?.value}`
                   : `content/connectors`,
               });
             }}