[2.0.x] Add Z_AFTER_PROBING option (#10058)

Some "fix-mounted" probes need manual stowing. And after probing some may prefer to raise or lower the nozzle. This restores an old option but tailors it to allow raise or lower as preferred.

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

@@ -733,7 +733,7 @@ void GcodeSuite::G29() {
 
     #endif // AUTO_BED_LEVELING_3POINT
 
-    // Stow the probe, raising if not fix-mounted.
+    // Stow the probe. No raise for FIX_MOUNTED_PROBE.
     if (STOW_PROBE()) {
       set_bed_leveling_enabled(abl_should_enable);
       measured_z = NAN;
@@ -967,12 +967,16 @@ void GcodeSuite::G29() {
     if (DEBUGGING(LEVELING)) SERIAL_ECHOLNPGM("<<< G29");
   #endif
 
-  report_current_position();
-
   KEEPALIVE_STATE(IN_HANDLER);
 
   if (planner.leveling_active)
     SYNC_PLAN_POSITION_KINEMATIC();
+
+  #if HAS_BED_PROBE
+    move_z_after_probing();
+  #endif
+
+  report_current_position();
 }
 
 #endif // OLDSCHOOL_ABL