[2.0.x] Automatically reset stepper timeout (#10179)

* Automatically reset stepper timeout in manage_inactivity

Any code that adds moves to the planner can skip resetting the stepper timeout. We can let `idle` / `manage_inactivity` reset the timer whenever it detects any moves in the planner.

* blocks_queued => has_blocks_queued

Marlin/src/gcode/temperature/M140_M190.cpp

@@ -122,7 +122,7 @@ void GcodeSuite::M190() {
     }
 
     idle();
-    refresh_cmd_timeout(); // to prevent stepper_inactive_time from running out
+    reset_stepper_timeout(); // Keep steppers powered
 
     const float temp = thermalManager.degBed();