[PowerToys Run] Use global HotKey instead of low level keyboard hook (#13114)

* [PowerToys Run] Register global HotKey

Using low level keyboard hooks caused focus issues when invoking
PowerToys Run. Using a global HotKey solves this issue.

* Properly unregister hotkey on dispose

* fix spellchecker errors

src/modules/launcher/PowerLauncher/App.xaml.cs

@@ -138,7 +138,6 @@ namespace PowerLauncher
                 bootTime.Stop();
 
                 Log.Info(textToLog.ToString(), GetType());
-                _mainVM.RegisterHotkey();
                 PowerToysTelemetry.Log.WriteEvent(new LauncherBootEvent() { BootTimeMs = bootTime.ElapsedMilliseconds });
 
                 // [Conditional("RELEASE")]