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

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

projects/hip-tests/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(hipEventSynchronize(event));
   HIP_CHECK(hipEventDestroy(event));
 }