Initial DD keycode regen workflow (#19400)

util/regen.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+qmk generate-rgb-breathe-table -o quantum/rgblight/rgblight_breathe_table.h
+qmk generate-keycodes --version latest -o quantum/keycodes.h
+
+for lang in $(find data/constants/keycodes/extras/ -type f -printf "%f\n"  | sed "s/keycodes_\(.*\)_[0-9].*/\1/"); do
+  qmk generate-keycode-extras --version latest --lang $lang -o quantum/keymap_extras/keymap_$lang.h
+done