Revert "feat(tools): add exec tool enhancement with background execution and …"

This reverts commit f901af8cbc.

pkg/tools/session_process_windows.go

@@ -1,13 +0,0 @@
-//go:build windows
-
-package tools
-
-import (
-	"os/exec"
-	"strconv"
-)
-
-func killProcessGroup(pid int) error {
-	_ = exec.Command("taskkill", "/T", "/F", "/PID", strconv.Itoa(pid)).Run()
-	return nil
-}