Why is Az.Reservation not included in the Azure PowerShell MSI Installer?

### Description

Hi,

For reasons that are not relevant here I use the MSI installer. When I tried to use the Get-AzReservation I get this message:

WARNING: The command Get-AzReservation is part of Azure PowerShell module "Az.Reservations" and it is not installed. Run "Install-Module Az.Reservations" to install it.
Get-AzReservation : The term 'Get-AzReservation' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
again.
At line:1 char:1
+ Get-AzReservation
+ ~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (Get-AzReservation:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException

I tried installing the latest MSI (9.3) and the error is the same, checked ${env:ProgramFiles}\WindowsPowerShell\Modules and Az.Reservation is not there so it seems it is not included in the MSI installer...

Is there a reason for this?

### Script or Debug output

_No response_

### Environment data

_No response_

### Module versions

_No response_

### Error output

_No response_