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/streamperthread/hipStreamPerThrdTsts.cc

@@ -251,6 +251,9 @@ static void EventSync() {
   } else {
     IfTestPassed = true;
   }
+
+  HIP_CHECK(hipEventDestroy(start));
+  HIP_CHECK(hipEventDestroy(end));
 }
 
 /* Launch a kernel in hipStreamPerThread, while it is in flight check for
@@ -475,6 +478,7 @@ TEST_CASE("Unit_hipStreamPerThread_StrmWaitEvt") {
   }
   HIP_CHECK(hipFree(Ad));
   HIP_CHECK(hipFree(Ad1));
+  HIP_CHECK(hipEventDestroy(e1));
   HIP_CHECK(hipStreamDestroy(Strm));
   delete[] Ah;
   delete Ah1;

catch/unit/streamperthread/hipStreamPerThread_Event.cc

@@ -23,6 +23,7 @@ TEST_CASE("Unit_hipStreamPerThread_EventRecord") {
   hipEvent_t event;
   HIP_CHECK(hipEventCreate(&event));
   HIP_CHECK(hipEventRecord(event, hipStreamPerThread));
+  HIP_CHECK(hipEventDestroy(event));
 }
 
 __global__ void update_even_odd(unsigned int N, int* out) {
@@ -61,4 +62,9 @@ TEST_CASE("Unit_hipStreamPerThread_EventSynchronize") {
       REQUIRE(false);
     }
   }
-}
+
+  HIP_CHECK(hipHostFree(A_h));
+  HIP_CHECK(hipFree(A_d));
+  HIP_CHECK(hipEventDestroy(start));
+  HIP_CHECK(hipEventDestroy(end));
+}