Unix platform elevation enhancements v2 (#7658)

* Remove multiple send password actions on Unix elev

* Remove CoreAdminHandler password verification

This is useless since already handled in
v2rayN/v2rayN.Desktop/Views/SudoPasswordInputView.axaml.cs with
CheckSudoPasswordAsync().

* Disable caching and prompt for sudo call

* Cleanup CoreAdminHandler pwd verify remains

* Migrate sudo opts to initial pwd verification

v2rayN/v2rayN.Desktop/Views/SudoPasswordInputView.axaml.cs

@@ -64,8 +64,8 @@ public partial class SudoPasswordInputView : UserControl
     {
         try
         {
-            // Use sudo -S echo command to verify password
-            var arg = new List<string>() { "-c", "sudo -S echo SUDO_CHECK" };
+            // Use sudo echo command to verify password
+            var arg = new List<string>() { "-c", "sudo -S -k -p '' echo SUDO_CHECK" };
             var result = await CliWrap.Cli
                 .Wrap(Global.LinuxBash)
                 .WithArguments(arg)