ModuleFast/PWSHGallery do not have support for hiding/filtering unlisted packages

Because pwsh.gallery does not handle prereleases properly, at least for some modules, ModuleFast offers prerelease versions as stable.

More info in this issue:

Testing with PowerShell v7.4.6 `-NoProfile` and ModuleFast v0.5.1:

```pwsh
PowerShell 7.4.6
PS C:\Users\olav.birkeland> Import-module -name 'modulefast'
PS C:\Users\olav.birkeland> $Destination = [string] '{0}\Microsoft\PowerShell\Modules' -f $env:LOCALAPPDATA
PS C:\Users\olav.birkeland> $InstalledModules = [string[]](
>> [System.IO.Directory]::GetDirectories($Destination).ForEach{$_.Split([System.IO.Path]::DirectorySeparatorChar)[-1]}
>> )
PS C:\Users\olav.birkeland> ModuleFast\Install-ModuleFast -Destination $Destination -Name $InstalledModules `
>> -DestinationOnly -NoPSModulePathUpdate -NoProfileUpdate -Update -WhatIf
Install-ModuleFast [Plan ]
What if: Performing the operation "Install 2 Modules" on target "C:\Users\olav.birkeland\AppData\Local\Microsoft\PowerShell\Modules".

Name ModuleVersion Location
---- ------------- --------
EnterprisePolicyAsCode 10.7.6 https://pwsh.gallery/flatcontainer/enterprisepolicyascode/10.7.6/enterprisepolicyascode.10.7.6.nupkg
Microsoft.PowerShell.ThreadJob 3.0.0 https://pwsh.gallery/flatcontainer/microsoft.powershell.threadjob/3.0.0/microsoft.powershell.threadjob.3.0.0.nupkg

PS C:\Users\olav.birkeland>
```

* EnterprisePolicyAsCode v10.7.6 is a prerelease, `10.7.6-beta`
* Microsoft.PowerShell.ThreadJob v3.0.0 does not exist anywhere else (PowerShell Gallery, repo)

Start by reproducing the PowerShell 7.4.6 example with ModuleFast v0.5.1 and the Install-ModuleFast entry point. Review how prerelease and unlisted packages are selected, including the linked PWSHGallery issue, and verify that prereleases are not presented as stable and nonexistent packages are filtered or hidden.

Vom Indexierungsmodell aus dem Issue-Text verfasst.