[Security Solution] Unskip isolate from timeline test (#169479)

## Summary

Resolves: https://github.com/elastic/kibana/issues/165344

The above test was skipped some time back due to a legitimate but that
caused an error toast to show up and block a button. It has since been
resolved, so unskipping here.


### 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

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/test/security_solution_endpoint/apps/endpoint/endpoint_solution_integrations.ts

@@ -62,8 +62,7 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
       }
     });
 
-    // FLAKY: https://github.com/elastic/kibana/issues/165344
-    describe.skip('from Timeline', () => {
+    describe('from Timeline', () => {
       let timeline: TimelineResponse;
 
       before(async () => {