Remove unused export of CmdletSessionId from generated shell script

Author: johanste

src/CLU/Microsoft.CLU.Run/PackageManagementMode.cs

@@ -543,10 +543,6 @@ private static void GenerateScript(string cfgPath)
                 File.WriteAllLines(scriptPath, new string[]
                 {
                     "#!/bin/bash",
-                    "if [ -z ${CmdletSessionID} ]",
-                    "then",
-                    "  export CmdletSessionID=$PPID",
-                    "fi",
                     "SCRIPTPATH=$(dirname \"$0\")",
                     $"$SCRIPTPATH/clurun -s {scriptName} -r $SCRIPTPATH/{Path.GetFileName(cfgPath)} \"$@\""
                 });