Changed the name of UnitTests to rccl-UnitTests (wrapper executable included).

test/common/UnitTests

@@ -0,0 +1,10 @@
+#/*************************************************************************
+# * Copyright (c) 2022 Advanced Micro Devices, Inc. All rights reserved.
+# *
+# * See LICENSE.txt for license information
+# ************************************************************************/
+
+#!/bin/bash 
+echo "The RCCL test client name has changed from UnitTests to rccl-UnitTests. Please make sure to execute the rccl-UnitTests instead."
+
+./rccl-UnitTests $@