Unify debugging output with debug_out.h (#13388)

Marlin/src/core/debug_out.h

Marlin/src/core/serial.h

Marlin/src/core/utility.cpp

Marlin/src/core/utility.h

Marlin/src/feature/bedlevel/abl/abl.cpp

Marlin/src/feature/bedlevel/bedlevel.cpp

Marlin/src/feature/bedlevel/ubl/ubl.h

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

Marlin/src/feature/prusa_MMU2/mmu2.cpp

Marlin/src/gcode/bedlevel/abl/G29.cpp

Marlin/src/gcode/calibrate/G28.cpp

Marlin/src/gcode/calibrate/G34_M422.cpp

Marlin/src/gcode/calibrate/M666.cpp

Marlin/src/gcode/control/M111.cpp

Marlin/src/gcode/control/T.cpp

Marlin/src/gcode/feature/L6470/M906.cpp

Marlin/src/gcode/feature/L6470/M916-918.cpp

Marlin/src/gcode/host/M114.cpp

Marlin/src/libs/L6470/L6470_Marlin.cpp

Marlin/src/libs/L6470/L6470_Marlin.h