IVGCVSW-7854 Remove/rewrite asserts in the backends unit tests.

* Replace calls to ARMNN_ASSERT with DOCTEST CHECK.

Signed-off-by: Colm Donelan <colm.donelan@arm.com>
Change-Id: I8904d169b2099d57a344e319b2f14cf5d8392ae8
diff --git a/src/backends/backendsCommon/test/layerTests/SoftmaxTestImpl.cpp b/src/backends/backendsCommon/test/layerTests/SoftmaxTestImpl.cpp
index 63375f0..3f4453c 100644
--- a/src/backends/backendsCommon/test/layerTests/SoftmaxTestImpl.cpp
+++ b/src/backends/backendsCommon/test/layerTests/SoftmaxTestImpl.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2017 Arm Ltd and Contributors. All rights reserved.
+// Copyright © 2017, 2024 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -104,7 +104,7 @@
     outputHandle->Allocate();
     CopyDataToITensorHandle(inputHandle.get(), input.data());
 
-    ARMNN_ASSERT(workload);
+    CHECK(workload);
 
     ExecuteWorkload(*workload, memoryManager);