CmdPal: entirely redo the Run page (#39955)

This entirely rewrites the shell page. It feels a lot more like the old
run dialog now.

* It's got icons for files & exes
* it can handle network paths
* it can handle `commands /with args...`
* it'll suggest files in that path as you type
* it handles `%environmentVariables%`
* it handles `"Paths with\spaces in them"`
* it shows you the path as a suggestion, in the text box, as you move
the selection


References:
Closes #39044
Closes #39419
Closes #38298
Closes #40311


### Remaining todo's
* [x] Remove the `GenerateAppxManifest` change, and file something to
fix that. We are still generating msix's on every build, wtf
* [x] Clean-up code
* [x] Double-check loc
* [x] Remove a bunch of debug printing that we don't need anymore
* [ ] File a separate PR for moving the file (indexer) commands into a
common project, and re-use those here
* [x] Add history support again! I totally tore that out
  * did that in #40427 
* [x] make `shell:` paths and weird URI's just work. Good test is
`x-cmdpal://settings`

### further optimizations that probably aren't blocking
* [x] Our fast up-to-date is clearly broken, but I think that's been
broken since early 0.91
* [x] If the exe doesn't change, we don't need to create a new ListItem
for it. We can just re-use the current one, and just change the args
* [ ] if the directory hasn't changed, but we typed more chars (e.g.
`c:\windows\s` -> `c:\windows\sys`), we should cache the ListItem's from
the first query, and re-use them if possible.

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Indexer/FallbackOpenFileItem.cs

@@ -23,6 +23,8 @@ internal sealed partial class FallbackOpenFileItem : FallbackCommandItem, System
 
     private uint _queryCookie = 10;
 
+    private Func<string, bool> _suppressCallback;
+
     public FallbackOpenFileItem()
         : base(_baseCommandWithId, Resources.Indexer_Find_Path_fallback_display_title)
     {
@@ -44,6 +46,17 @@ internal sealed partial class FallbackOpenFileItem : FallbackCommandItem, System
             return;
         }
 
+        if (_suppressCallback != null && _suppressCallback(query))
+        {
+            Command = new NoOpCommand();
+            Title = string.Empty;
+            Subtitle = string.Empty;
+            Icon = null;
+            MoreCommands = null;
+
+            return;
+        }
+
         if (Path.Exists(query))
         {
             // Exit 1: The query is a direct path to a file. Great! Return it.
@@ -128,4 +141,9 @@ internal sealed partial class FallbackOpenFileItem : FallbackCommandItem, System
         _searchEngine.Dispose();
         GC.SuppressFinalize(this);
     }
+
+    public void SuppressFallbackWhen(Func<string, bool> callback)
+    {
+        _suppressCallback = callback;
+    }
 }

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Indexer/IndexerCommandsProvider.cs

@@ -2,6 +2,7 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
 using Microsoft.CmdPal.Ext.Indexer.Data;
 using Microsoft.CmdPal.Ext.Indexer.Properties;
 using Microsoft.CommandPalette.Extensions;
@@ -41,4 +42,9 @@ public partial class IndexerCommandsProvider : CommandProvider
         [
             _fallbackFileItem
         ];
+
+    public void SuppressFallbackWhen(Func<string, bool> callback)
+    {
+        _fallbackFileItem.SuppressFallbackWhen(callback);
+    }
 }