Do not generate clean block in proxy command when the feature is disabled

[daxian-dbw]

PR Summary

Fix #17110
When the PSCleanBlock experimental feature is not enabled, ProxyCommand.Create should not generate the clean block for the proxy function.

After the fix,

1. when the feature is disabled, generated proxy function for Get-Command doesn't have the clean block in it:

   PS:4> [System.Management.Automation.ProxyCommand]::Create($cm)
   [CmdletBinding(DefaultParameterSetName='CmdletSet', HelpUri='https://go.microsoft.com/fwlink/?LinkID=2096579')]
   param(
      .... ## skip the long param block
      )
   
   begin
   {
       ... ## skip the long begin block
   }
   
   process
   {
       try {
           $steppablePipeline.Process($_)
       } catch {
           throw
       }
   }
   
   end
   {
       try {
           $steppablePipeline.End()
       } catch {
           throw
       }
   }
   
   <#
   
   .ForwardHelpTargetName Microsoft.PowerShell.Core\Get-Command
   .ForwardHelpCategory Cmdlet
   
   #>

2. When the feature is enabled, the generated proxy function for Get-Command has the clean block in it:

   PS:3> [System.Management.Automation.ProxyCommand]::Create($cm)
   [CmdletBinding(DefaultParameterSetName='CmdletSet', HelpUri='https://go.microsoft.com/fwlink/?LinkID=2096579')]
   param(
      ... ## skip the long param block
       )
   
   begin
   {
       ... ## skip the long begin block
   }
   
   process
   {
       try {
           $steppablePipeline.Process($_)
       } catch {
           throw
       }
   }
   
   end
   {
       try {
           $steppablePipeline.End()
       } catch {
           throw
       }
   }
   
   clean
   {
       if ($null -ne $steppablePipeline) {
           $steppablePipeline.Clean()
       }
   }
   
   <#
   
   .ForwardHelpTargetName Microsoft.PowerShell.Core\Get-Command
   .ForwardHelpCategory Cmdlet
   
   #>

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[PaulHigin]

LGTM

[PaulHigin]

This breaks JEA as it uses RestrictedSessions, so we should consider for backport.

[daxian-dbw]

The clean block is new to PS 7.3 preview (I think available in 7.3-preview.1), so no backport is needed.

[ghost]

🎉v7.3.0-preview.4 has been released which incorporates this pull request.:tada:

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