Flaky test for gropu operation

[VitaliySerov]

Sometimes creation of group is failing with this reason:

 response:
         {
           "status": 1,
           "statusCode": 403,
           "error": {
             "message": "Collection was modified; enumeration operation may not execute.",
             "hresult": -2146233079,
             "data": {
             }
           }
         }

Also can be reproduces manually:

I've told @Carazyda to investigate the issue - probably (99% sure) - but on portals side

But until the bug created or workaround found - this will be an issue (and test will be skipped)