Flaky: TestSDKServerWatchGameServerFeatureSDKWatchSendOnExecute

Switching default: case to a timeout, since due to the asynchronous
nature of event processing, it could take a moment or two for the extra
event to be processed.

This is particularly true on the CI system, where there is a lot of
processing going on, and it may take more time than usual to process.

pkg/sdkserver/sdkserver_test.go

@@ -718,7 +718,7 @@ func TestSDKServerWatchGameServerFeatureSDKWatchSendOnExecute(t *testing.T) {
 			} else {
 				assert.Fail(t, "Channel is closed!")
 			}
-		default:
+		case <-time.After(30 * time.Second):
 			t.Log("No gameserver in the stream, moving on.")
 		}
 	}