SWDEV-485763 - Fix memory leaks in various unit tests

Fix memory leaks by adding missing destroy calls for
events, streams, and graphs at the end of tests.

Ensure that every test case executes destroy calls,
regardless of whether it passes or fails.

Change-Id: I814e35c528d90ed2abb34d77377f1a7fd3f1f11c

catch/unit/module/hipExtModuleLaunchKernel.cc

@@ -254,6 +254,7 @@ TEST_CASE("Unit_hipExtModuleLaunchKernel_Positive_Parameters") {
                                        start_event, nullptr));
     HIP_CHECK(hipDeviceSynchronize());
     HIP_CHECK(hipEventQuery(start_event));
+    HIP_CHECK(hipEventDestroy(start_event));
   }
 
   SECTION("Pass only stop event") {
@@ -265,6 +266,7 @@ TEST_CASE("Unit_hipExtModuleLaunchKernel_Positive_Parameters") {
                                        nullptr, stop_event));
     HIP_CHECK(hipDeviceSynchronize());
     HIP_CHECK(hipEventQuery(stop_event));
+    HIP_CHECK(hipEventDestroy(stop_event));
   }
 }