MLECO-4490: Upgrade MLEK Catch Unit tests

*Removed default behaviour of unit-test executables to redirect output
to file.
*Accompanying change made to CI script to generate xml files there instead.
*Switched to newer minor version of Catch.
*Note: Support for simultaneous output to console and file is available in new major version (Catch 3).

Other unit test cleanup:
* Redundant warnings about common tests output removed
* Static cast added to silence compiler warning
* Removed additional printing in RNNoiseModelTests

Signed-off-by: Liam Barry <liam.barry@arm.com>
Change-Id: If9d7f366ec205a7cd49a45198a15867ef7b75afd
diff --git a/tests/common/SlidingWindowTests.cc b/tests/common/SlidingWindowTests.cc
index 33fe65e..b856e16 100644
--- a/tests/common/SlidingWindowTests.cc
+++ b/tests/common/SlidingWindowTests.cc
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: Copyright 2021 Arm Limited and/or its affiliates <open-source-office@arm.com>
+ * SPDX-FileCopyrightText: Copyright 2021,2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -175,12 +175,12 @@
     REQUIRE(slider.Index() == 0);
     for (int i = 0; i < 5; i++) {
         slider.Next();
-        REQUIRE(slider.Index() == i);
+        REQUIRE(static_cast<int>(slider.Index()) == i);
     }
 }
 
 
-TEST_CASE("Common: Total strides") 
+TEST_CASE("Common: Total strides")
 {
     std::vector<int> test{1, 2, 3, 4, 5};