[SYCL][E2E] Fix memory leak in test (#11468)

Signed-off-by: Tikhomirova, Kseniya <[email protected]>

Author: KseniyaTikhomirova

sycl/test-e2e/ProgramManager/uneven_kernel_split.cpp

@@ -41,5 +41,6 @@ int main() {
     host_foo(q, buf);
   }
   q.wait();
+  sycl::free(buf, q);
   return 0;
 }