Improve code quality

Author: Jack251970

Flow.Launcher.Core/Plugin/PluginConfig.cs

@@ -6,6 +6,7 @@
 using Flow.Launcher.Plugin;
 using System.Text.Json;
 using CommunityToolkit.Mvvm.DependencyInjection;
+using Flow.Launcher.Infrastructure.UserSettings;
 
 namespace Flow.Launcher.Core.Plugin
 {
@@ -30,7 +31,7 @@ public static List<PluginMetadata> Parse(string[] pluginDirectories)
             // todo use linq when diable plugin is implmented since parallel.foreach + list is not thread saft
             foreach (var directory in directories)
             {
-                if (File.Exists(Path.Combine(directory, "NeedDelete.txt")))
+                if (File.Exists(Path.Combine(directory, DataLocation.PluginDeleteFile)))
                 {
                     try
                     {

Flow.Launcher.Core/Plugin/PluginManager.cs

@@ -815,7 +815,7 @@ internal static async Task<bool> UninstallPluginAsync(PluginMetadata plugin, boo
             }
 
             // Marked for deletion. Will be deleted on next start up
-            using var _ = File.CreateText(Path.Combine(plugin.PluginDirectory, "NeedDelete.txt"));
+            using var _ = File.CreateText(Path.Combine(plugin.PluginDirectory, DataLocation.PluginDeleteFile));
 
             if (checkModified)
             {

Flow.Launcher.Infrastructure/UserSettings/DataLocation.cs

@@ -42,6 +42,7 @@ public static bool PortableDataLocationInUse()
         public const string PythonEnvironmentName = "Python";
         public const string NodeEnvironmentName = "Node.js";
         public const string PluginEnvironments = "Environments";
+        public const string PluginDeleteFile = "NeedDelete.txt";
         public static string PluginEnvironmentsPath => Path.Combine(DataDirectory(), PluginEnvironments);
     }
 }