Skip flaky TestTrialLicense (#18125)

https://mattermost.atlassian.net/browse/MM-36695

```release-note
NONE
```

api4/license_test.go

@@ -219,6 +219,7 @@ func TestRequestTrialLicense(t *testing.T) {
 	})
 
 	t.Run("trial license user count less than current users", func(t *testing.T) {
+		t.Skip("MM-36695")
 		resp, err := th.SystemAdminClient.RequestTrialLicense(1)
 		CheckErrorID(t, err, "api.license.add_license.unique_users.app_error")
 		CheckBadRequestStatus(t, resp)