[SYCL] Add work_group_static header to sycl.hpp (#20842)

Adding the work_group_static.hpp header to sycl.hpp was missed in the
implementation of the extension. This commit amends this.

Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>

Author: steffenlarsen

sycl/include/sycl/sycl.hpp

@@ -156,6 +156,7 @@ can be disabled by setting SYCL_DISABLE_FSYCL_SYCLHPP_WARNING macro.")
 #include <sycl/ext/oneapi/virtual_mem/physical_mem.hpp>
 #include <sycl/ext/oneapi/virtual_mem/virtual_mem.hpp>
 #include <sycl/ext/oneapi/weak_object.hpp>
+#include <sycl/ext/oneapi/work_group_static.hpp>
 #include <sycl/khr/dynamic_addrspace_cast.hpp>
 #include <sycl/khr/free_function_commands.hpp>
 #include <sycl/khr/group_interface.hpp>