[cmdpal][AOT] make some built-in extensions able to be published with native AOT enabled (#39802)

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fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Base on my test, some built-in extensions can be published with native
AOT enabled with a little changes. (see this branch:
https://github.com/microsoft/PowerToys/pull/39605).

1. SystemCommands: no change need. Removed some unused code.
2. WinGet: disable marshalling. and do a little changes in
CreateInstance.
3. WindowWalker: use source generation to call CoCreateInstance.
4. WindowsTerminal: use source generation to call
IApplicationActivationManager interface.

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## PR Checklist

- [x] **Closes:** #39869
- [x] **Communication:** I've discussed this with core contributors
already. If work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end user facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

---------

Co-authored-by: Yu Leng <yuleng@microsoft.com>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WinGet/Microsoft.CmdPal.Ext.WinGet.csproj

@@ -32,6 +32,11 @@
     <Manifest Include="$(ApplicationManifest)" />
   </ItemGroup>
 
+  <ItemGroup>
+    <AdditionalFiles Include="NativeMethods.txt" />
+    <AdditionalFiles Include="NativeMethods.json" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\..\..\common\ManagedCommon\ManagedCommon.csproj" />
     <ProjectReference Include="..\..\extensionsdk\Microsoft.CommandPalette.Extensions.Toolkit\Microsoft.CommandPalette.Extensions.Toolkit.csproj" />

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WinGet/NativeMethods.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "https://aka.ms/CsWin32.schema.json",
+  "allowMarshaling": false,
+  "comInterop": {
+    "preserveSigMethods": [ "*" ]
+  }
+}

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WinGet/WindowsPackageManager.Interop/WindowsPackageManagerStandardFactory.cs

@@ -20,20 +20,25 @@ public class WindowsPackageManagerStandardFactory : WindowsPackageManagerFactory
     protected override T CreateInstance<T>(Guid clsid, Guid iid)
     {
         var pUnknown = IntPtr.Zero;
-        try
+        unsafe
         {
-            var hr = PInvoke.CoCreateInstance(clsid, null, CLSCTX.CLSCTX_ALL, iid, out var result);
-            Marshal.ThrowExceptionForHR(hr);
-            pUnknown = Marshal.GetIUnknownForObject(result);
-            return MarshalGeneric<T>.FromAbi(pUnknown);
-        }
-        finally
-        {
-            // CoCreateInstance and FromAbi both AddRef on the native object.
-            // Release once to prevent memory leak.
-            if (pUnknown != IntPtr.Zero)
+            try
             {
-                Marshal.Release(pUnknown);
+                var hr = PInvoke.CoCreateInstance(clsid, null, CLSCTX.CLSCTX_ALL, iid, out var result);
+                Marshal.ThrowExceptionForHR(hr);
+
+                pUnknown = new IntPtr(result);
+
+                return MarshalGeneric<T>.FromAbi(pUnknown);
+            }
+            finally
+            {
+                // CoCreateInstance and FromAbi both AddRef on the native object.
+                // Release once to prevent memory leak.
+                if (pUnknown != IntPtr.Zero)
+                {
+                    Marshal.Release(pUnknown);
+                }
             }
         }
     }