Remove deprecated led_set_kb (#19273)

* Remove led_set_kb maintaining existing led_set_user behaviour

* Also call led_set_user

docs/hardware_keyboard_guidelines.md

@@ -188,7 +188,7 @@ The following functions are typically defined in this file:
 * `void matrix_init_kb(void)`
 * `void matrix_scan_kb(void)`
 * `bool process_record_kb(uint16_t keycode, keyrecord_t *record)`
-* `void led_set_kb(uint8_t usb_led)`
+* `bool led_update_kb(led_t led_state)`
 
 ### `<keyboard_name.h>`