(chocolatey#3327) Improves initialization handling

Won't run in environments where DotNet 4.8 has been installed where
running in PS<=3, due to the issues found when testing in those
environments.

Also improves the handling of errors, as previously we were never
"reaching" an error due to the way Choco CLI's streams and exit codes
work out.

nuspec/chocolatey/chocolatey/tools/chocolateysetup.psm1

@@ -834,17 +834,27 @@ function Install-DotNet48IfMissing {
 }
 
 function Invoke-Chocolatey-Initial {
+    if ($PSVersionTable.Major -le 3 -and $script:DotNetInstallRequiredReboot) {
+        Write-Debug "Skipping initialization due to known issues before rebooting."
+        return
+    }
+
     Write-Debug "Initializing Chocolatey files, etc by running Chocolatey CLI..."
 
     try {
         $chocoInstallationFolder = Get-ChocolateyInstallFolder
         $chocoExe = Join-Path -Path $chocoInstallationFolder -ChildPath "choco.exe"
-        $runResult = & $chocoExe -v
-        Write-Debug "Chocolatey CLI execution completed successfully."
+        $runResult = & $chocoExe -v *>&1
+        if ($LASTEXITCODE -eq 0) {
+            Write-Debug "Chocolatey CLI execution completed successfully."
+        }
+        else {
+            throw
+        }
     }
     catch {
         Write-ChocolateyWarning "Unable to run Chocolatey CLI at this time:`n$($runResult)"
     }
 }
 
-Export-ModuleMember -Function Initialize-Chocolatey;
+Export-ModuleMember -Function Initialize-Chocolatey