chore(tool,import) : dispose result of async task to prevent warnings

Author: arthur740212

Assets/Plugins/Source/Editor/EditorWindows/InstallEOSZipWindow.cs

@@ -249,7 +249,7 @@ protected override void RenderWindow()
                             // This should be the correct directory
                             var projectDir = FileUtility.GetProjectPath();
                             // TODO: Async not tested here.
-                            PackageFileUtility.CopyFilesToDirectory(projectDir, fileResults);
+                            _ = PackageFileUtility.CopyFilesToDirectory(projectDir, fileResults);
                         }
                     }