fix(esp_stdio): remap console select fd bits to sink device

Map logical /dev/console fds to the primary sink fd for select.
This avoids probing UART1/UART2 for stdout/stderr and keeps UART select state consistent.
Add stdio regression checks for logical fd mapping and symmetric uart_end_select teardown.

components/esp_driver_uart/src/uart_vfs.c

@@ -588,7 +588,6 @@ static esp_err_t uart_end_select(void *end_select_args)
             if (s_uart_select_count[i] == 0) {
                 uart_set_select_notif_callback(i, NULL);
             }
-            break;
         }
     }
     portEXIT_CRITICAL(uart_get_selectlock());