Swapped to another check for NPU on system (openvinotoolkit#28730)

### Details:
- *Switched to use of `get_core()->get_property("NPU",
ov::available_devices)`*
 - *...*

### Tickets:
 - *CVS-161330*

Author: AsyaPronina

src/plugins/intel_npu/src/plugin/npuw/llm_compiled_model.cpp

@@ -303,8 +303,8 @@ struct NPUDesc {
 };
 
 std::optional<NPUDesc> extract_npu_descriptor(const std::shared_ptr<const ov::IPlugin>& plugin) {
-    const auto all_devices = plugin->get_core()->get_available_devices();
-    if (std::find(all_devices.begin(), all_devices.end(), "NPU") == all_devices.end()) {
+    const auto all_devices = plugin->get_core()->get_property("NPU", ov::available_devices);
+    if (all_devices.empty()) {
         return std::nullopt;
     }