CmdPal: Add settings to hide non-apps from results (#45741)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

This PR adds new options to the All Apps built-in extension:

- Also include non-app shortcuts from the Start menu
  - Enabled by default
- Also include non-app shortcuts from the desktop
  - Disabled by default

The default states reflect that Start menu shortcuts are largely curated
by installers, and the Start menu itself typically does not surface
non-app items. Desktop shortcuts, on the other hand, are more likely to
be created by the user.

<img width="812" height="499" alt="image"
src="https://github.com/user-attachments/assets/de6c4723-0b52-4606-98fa-469364f5648e"
/>

src/modules/cmdpal/Tests/Microsoft.CmdPal.Ext.Apps.UnitTests/Settings.cs

@@ -13,6 +13,8 @@ public class Settings : ISettingsInterface
     private readonly bool enableDesktopSource;
     private readonly bool enableRegistrySource;
     private readonly bool enablePathEnvironmentVariableSource;
+    private readonly bool includeNonAppsOnDesktop;
+    private readonly bool includeNonAppsInStartMenu;
     private readonly List<string> programSuffixes;
     private readonly List<string> runCommandSuffixes;
 
@@ -21,6 +23,8 @@ public class Settings : ISettingsInterface
         bool enableDesktopSource = true,
         bool enableRegistrySource = true,
         bool enablePathEnvironmentVariableSource = true,
+        bool includeNonAppsOnDesktop = false,
+        bool includeNonAppsInStartMenu = true,
         List<string> programSuffixes = null,
         List<string> runCommandSuffixes = null)
     {
@@ -28,6 +32,8 @@ public class Settings : ISettingsInterface
         this.enableDesktopSource = enableDesktopSource;
         this.enableRegistrySource = enableRegistrySource;
         this.enablePathEnvironmentVariableSource = enablePathEnvironmentVariableSource;
+        this.includeNonAppsOnDesktop = includeNonAppsOnDesktop;
+        this.includeNonAppsInStartMenu = includeNonAppsInStartMenu;
         this.programSuffixes = programSuffixes ?? new List<string> { "bat", "appref-ms", "exe", "lnk", "url" };
         this.runCommandSuffixes = runCommandSuffixes ?? new List<string> { "bat", "appref-ms", "exe", "lnk", "url", "cpl", "msc" };
     }
@@ -40,6 +46,10 @@ public class Settings : ISettingsInterface
 
     public bool EnablePathEnvironmentVariableSource => enablePathEnvironmentVariableSource;
 
+    public bool IncludeNonAppsOnDesktop => includeNonAppsOnDesktop;
+
+    public bool IncludeNonAppsInStartMenu => includeNonAppsInStartMenu;
+
     public List<string> ProgramSuffixes => programSuffixes;
 
     public List<string> RunCommandSuffixes => runCommandSuffixes;