process_keycode: remove direct quantum.h includes (#21486)

quantum/process_keycode/process_grave_esc.c

@@ -14,6 +14,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "process_grave_esc.h"
+#include "keycodes.h"
+#include "modifiers.h"
+#include "action_util.h"
 
 /* true if the last press of QK_GRAVE_ESCAPE was shifted (i.e. GUI or SHIFT were pressed), false otherwise.
  * Used to ensure that the correct keycode is released if the key is released.