[QNN EP] Clean up correctly from a partial setup (#23320)

### Description
Fix bug in previous change where a failure during `SetupBackend` causes `ReleaseResources `to be called to clean up but does nothing because `backend_setup_completed_ ` is false. `backend_setup_completed_ ` _seems_ to now be redundant so removing it fixes the problem.

### Motivation and Context
We are seeing crashes due to the log callback failing to be de-registered

onnxruntime/core/providers/qnn/builder/qnn_backend_manager.cc

@@ -1097,39 +1097,35 @@ Status QnnBackendManager::TerminateQnnLog() {
 }
 
 void QnnBackendManager::ReleaseResources() {
-  if (!backend_setup_completed_) {
-    return;
-  }
-
   auto result = ReleaseContext();
   if (Status::OK() != result) {
-    LOGS_DEFAULT(ERROR) << "Failed to ReleaseContext.";
+    LOGS_DEFAULT(ERROR) << "Failed to ReleaseContext: " << result.ErrorMessage();
   }
 
   result = ReleaseProfilehandle();
   if (Status::OK() != result) {
-    LOGS_DEFAULT(ERROR) << "Failed to ReleaseProfilehandle.";
+    LOGS_DEFAULT(ERROR) << "Failed to ReleaseProfilehandle: " << result.ErrorMessage();
   }
 
   result = ReleaseDevice();
   if (Status::OK() != result) {
-    LOGS_DEFAULT(ERROR) << "Failed to ReleaseDevice.";
+    LOGS_DEFAULT(ERROR) << "Failed to ReleaseDevice: " << result.ErrorMessage();
   }
 
   result = ShutdownBackend();
   if (Status::OK() != result) {
-    LOGS_DEFAULT(ERROR) << "Failed to ShutdownBackend.";
+    LOGS_DEFAULT(ERROR) << "Failed to ShutdownBackend: " << result.ErrorMessage();
   }
 
   result = TerminateQnnLog();
   if (Status::OK() != result) {
-    LOGS_DEFAULT(ERROR) << "Failed to TerminateQnnLog.";
+    LOGS_DEFAULT(ERROR) << "Failed to TerminateQnnLog: " << result.ErrorMessage();
   }
 
   if (backend_lib_handle_) {
     result = UnloadLib(backend_lib_handle_);
     if (Status::OK() != result) {
-      LOGS_DEFAULT(ERROR) << "Failed to unload backend library.";
+      LOGS_DEFAULT(ERROR) << "Failed to unload backend library: " << result.ErrorMessage();
     }
   }