Consolidate probe clearance, add section debug (#18576)

* Better section / function log
* Add do_z_clearance motion function

Marlin/src/gcode/calibrate/G34_M422.cpp

@@ -56,10 +56,8 @@
  *   R<recalculate> points based on current probe offsets
  */
 void GcodeSuite::G34() {
-  if (DEBUGGING(LEVELING)) {
-    DEBUG_ECHOLNPGM(">>> G34");
-    log_machine_info();
-  }
+  DEBUG_SECTION(log_G34, "G34", DEBUGGING(LEVELING));
+  if (DEBUGGING(LEVELING)) log_machine_info();
 
   do { // break out on error
 
@@ -367,8 +365,6 @@ void GcodeSuite::G34() {
     #endif
 
   }while(0);
-
-  if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("<<< G34");
 }
 
 /**