Fix kill => disable_all_heaters => print_job_timer.stop (#12146)

- Remove `print_job_timer.stop()` from `disable_all_heaters`
- Call `print_job_timer.stop()` for relevant `disable_all_heaters()`.
- Split up `kill()` for watchdog interrupt safety

Marlin/src/feature/I2CPositionEncoder.cpp

@@ -164,7 +164,7 @@ void I2CPositionEncoder::update() {
 
     #ifdef I2CPE_ERR_THRESH_ABORT
       if (ABS(error) > I2CPE_ERR_THRESH_ABORT * planner.settings.axis_steps_per_mm[encoderAxis]) {
-        //kill("Significant Error");
+        //kill(PSTR("Significant Error"));
         SERIAL_ECHOPGM("Axis error greater than set threshold, aborting!");
         SERIAL_ECHOLN(error);
         safe_delay(5000);