[Package Issue]: Microsoft.AppInstaller

### Please confirm these before moving forward

- [x] I have searched for my issue and not found a work-in-progress/duplicate/resolved issue.
- [x] I have not been informed if the issue is resolved in a preview version of the winget client.

### Category of the issue

Other

### Brief description of your issue

The https://github.com/microsoft/winget-pkgs/tree/master/manifests/m/Microsoft/AppInstaller folder currently lacks a `.validation` file for `Validation-No-Executables`.

There should be such a file.

Related: #411491.

### Steps to reproduce

1) Create a PR that modifies `Microsoft.AppInstaller` in some way.
2) Pipelines throw `Validation-No-Executables`, despite the wide knowledge that Winget itself is an executable.

### Actual behavior

Pipelines throw `Validation-No-Executables` when there is no reason to.

### Expected behavior

Pipelines for `Microsoft.AppInstaller` are given `Validation-Completed` automatically.

### Environment

```raw
Windows Package Manager (Preview) v1.30.90-preview
© 2026 Microsoft. All rights reserved.

Windows: Windows.Desktop v10.0.26200.8246
System Architecture: X64
Package: Microsoft.DesktopAppInstaller v1.30.90.0

WinGet Directories
-------------------------------------------------------------------------------------------------------------------------------
Logs %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\DiagOutputDir
User Settings %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\settings.json
Portable Links Directory (User) %LOCALAPPDATA%\Microsoft\WinGet\Links
Portable Links Directory (Machine) C:\Program Files\WinGet\Links
Portable Package Root (User) %LOCALAPPDATA%\Microsoft\WinGet\Packages
Portable Package Root C:\Program Files\WinGet\Packages
Portable Package Root (x86) C:\Program Files (x86)\WinGet\Packages
Installer Downloads %USERPROFILE%\Downloads
Configuration Modules %LOCALAPPDATA%\Microsoft\WinGet\Configuration\Modules

Links
---------------------------------------------------------------------------
Privacy Statement https://aka.ms/winget-privacy
License Agreement https://aka.ms/winget-license
Third Party Notices https://aka.ms/winget-3rdPartyNotice
Homepage https://aka.ms/winget
Windows Store Terms https://www.microsoft.com/en-us/storedocs/terms-of-sale

Group Policy State
--------------------------------------------------
Enable Windows App Installer Hash Override Enabled

Admin Setting State
--------------------------------------------------
LocalManifestFiles Enabled
BypassCertificatePinningForMicrosoftStore Disabled
InstallerHashOverride Enabled
LocalArchiveMalwareScanOverride Enabled
ProxyCommandLineOptions Disabled
ConfigurationProcessorPath Disabled
DefaultProxy Disabled
```

### Screenshots and Logs

_No response_

Start in the manifests/m/Microsoft/AppInstaller folder and review the related issue #411491 for the expected validation-file convention. Add the missing .validation entry for Validation-No-Executables, then create a PR modifying Microsoft.AppInstaller and confirm the pipelines report Validation-Completed.

Written by the indexing model from the issue text.