Add support for PowerShell 7.2+

PowerShell 7.2 has changed the way arguments are passed to executables. This was originally an experimental feature in 7.2, but as of 7.3 it is built-in. A simple "" is now sufficient for passing empty arguments, no back-tick escaping is required.

Fixes #1849

Merge spf13/cobra#1916

templates/completion.pwsh.gotmpl

@@ -69,7 +69,16 @@ Register-ArgumentCompleter -CommandName '{{ .CMDVarName }}' -ScriptBlock {
         # If the last parameter is complete (there is a space following it)
         # We add an extra empty parameter so we can indicate this to the go method.
         __{{ .CMDVarName }}_debug "Adding extra empty parameter"
-        $RequestComp="$RequestComp" + ' `"`"'
+        # PowerShell 7.2+ changed the way how the arguments are passed to executables,
+        # so for pre-7.2 or when Legacy argument passing is enabled we need to use
+        if ($PSVersionTable.PsVersion -lt [version]'7.2.0' -or
+            ($PSVersionTable.PsVersion -lt [version]'7.3.0' -and -not [ExperimentalFeature]::IsEnabled("PSNativeCommandArgumentPassing")) -or
+            (($PSVersionTable.PsVersion -ge [version]'7.3.0' -or [ExperimentalFeature]::IsEnabled("PSNativeCommandArgumentPassing")) -and
+            $PSNativeCommandArgumentPassing -eq 'Legacy')) {
+            $RequestComp="$RequestComp" + ' `"`"'
+        } else {
+            $RequestComp="$RequestComp" + ' ""'
+        }
     }
 
     __{{ .CMDVarName }}_debug "Calling $RequestComp"