SWDEV-548241 - Add missing destroy calls in graph tests (#520)

Co-authored-by: Vladana Stojiljkovic <Vladana.Stojiljkovic@amd.com>

projects/hip-tests/catch/unit/graph/hipGraphExecGetFlags.cc

@@ -60,6 +60,7 @@ TEST_CASE("Unit_hipGraphExecGetFlags_Negative") {
   HIP_CHECK(
       hipGraphInstantiateWithFlags(&graphExec, graph, hipGraphInstantiateFlagAutoFreeOnLaunch));
   HIP_CHECK_ERROR(hipGraphExecGetFlags(nullptr, &flags), hipErrorInvalidValue);
+  HIP_CHECK(hipGraphExecDestroy(graphExec));
   HIP_CHECK(hipGraphDestroy(graph));
 }
 
@@ -136,6 +137,7 @@ TEST_CASE("Unit_hipGraphExecGetFlags_positive") {
     REQUIRE(flags == hipGraphInstantiateFlagUseNodePriority);
   }
 #endif
+  HIP_CHECK(hipGraphExecDestroy(graphExec));
   HIP_CHECK(hipGraphDestroy(graph));
 }
 /**