ManifestComparator has odd behavior with local manifest

Brief description of your issue

I am trying to test with a local manifest. The manifest does not specify a scope (Scope == Unknown). When testing with the --manifest and --scope switch, it always results in No applicable installer found; see logs for more details.

Steps to reproduce

1. Make a clone of the winget-pkgs repo
2. run the command winget install --manifest D:\Git\winget-pkgs\manifests\m\Microsoft\AzureCLI\2.57.0 --scope user, adapting the file path as needed
3. Observe the failure
4. Run winget install Microsoft.AzureCLI --version 2.57.0 --source winget --scope user
5. Observe no failure

Expected behavior

Installer with unknown scope to be selected for local manifest install

Actual behavior

No applicable installer found; see logs for more details.

Environment

PS D:\Git\winget-pkgs> winget --info
Windows Package Manager (Preview) v1.7.3481-preview
Copyright (c) Microsoft Corporation. All rights reserved.

Windows: Windows.Desktop v10.0.19045.3930
System Architecture: X64
Package: Microsoft.DesktopAppInstaller v1.22.3481.0

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                D:\Users\Trenly\Downloads

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

Admin Setting                             State
--------------------------------------------------
LocalManifestFiles                        Enabled
BypassCertificatePinningForMicrosoftStore Disabled
InstallerHashOverride                     Disabled
LocalArchiveMalwareScanOverride           Enabled

Start with the ManifestComparator behavior exercised by the local --manifest install command, and reproduce the failure using the AzureCLI manifest and --scope user. Compare it with the successful package-source command; done means a local manifest whose scope is Unknown selects an applicable installer instead of reporting that none was found.