fix: remove validate_name_in_customer function

(cherry picked from commit 2b32d3644f)

erpnext/setup/doctype/customer_group/customer_group.py

@@ -71,14 +71,9 @@ class CustomerGroup(NestedSet):
 				)
 
 	def on_update(self):
-		self.validate_name_with_customer()
 		super().on_update()
 		self.validate_one_root()
 
-	def validate_name_with_customer(self):
-		if frappe.db.exists("Customer", self.name):
-			frappe.msgprint(_("A customer with the same name already exists"), raise_exception=1)
-
 
 def get_parent_customer_groups(customer_group):
 	lft, rgt = frappe.db.get_value("Customer Group", customer_group, ["lft", "rgt"])