SWDEV-1 - Fix warnings and update disabled test list (#163)

- Fix warnings in some test cases due to unused variables or signed/unsigned comparison.
- Disabled vulkan tests on MI200.

catch/unit/vulkan_interop/hipDestroyExternalMemory.cc

@@ -21,7 +21,9 @@ THE SOFTWARE.
 
 #include "vulkan_test.hh"
 
+#if HT_AMD && 0
 constexpr bool enable_validation = false;
+#endif
 
 TEST_CASE("Unit_hipDestroyExternalMemory_Vulkan_Negative_Parameters") {
   SECTION("extMem == nullptr") {
@@ -42,4 +44,4 @@ TEST_CASE("Unit_hipDestroyExternalMemory_Vulkan_Negative_Parameters") {
     HIP_CHECK_ERROR(hipDestroyExternalMemory(ext_memory), hipErrorInvalidValue);
   }
 #endif
-}
+}