CmdPal: Configure .editorconfig to format MSBuild files (#45739)

## Summary of the Pull Request

This PR configures the Command Palette's .editorconfig to format MSBuild
project and props files, and reformats the files accordingly.

No functional changes.

src/modules/cmdpal/ext/Common.ExtDependencies.props

@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project>
 
-<!-- 
+  <!--
   Common external dependencies for all CmdPal extensions:
   - Microsoft.WindowsAppSDK
   - Microsoft.Web.WebView2
   - Microsoft.CommandPalette.Extensions.Toolkit (via project reference)
 
   We need the WASDK reference because without it, our image assets won't get
-  placed into our final package correctly. 
+  placed into our final package correctly.
 
 -->
-    
+
   <ItemGroup>
     <PackageReference Include="Microsoft.WindowsAppSDK" />
     <PackageReference Include="Microsoft.Web.WebView2"  />