Remove unused showInfoToast during customer data fetch

internal_frontend/app/customers/page.tsx

@@ -46,7 +46,6 @@ export default function CustomersPage() {
                 throw new Error(`Failed to fetch customers: ${response.statusText}`);
             }
             const data = await response.json();
-            showInfoToast("Customers data loaded");
             setCustomers(data);
         } catch (error) {
             showError("Failed to fetch customers data (1)");