Add REPORT_TRAMMING_MM option (#19682)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/Configuration_adv.h

   #define TRAMMING_POINT_NAME_3 "Back-Right"
   #define TRAMMING_POINT_NAME_4 "Back-Left"
 
-  // Enable to restore leveling setup after operation
-  #define RESTORE_LEVELING_AFTER_G35
-
-  // Add a menu item for Assisted Tramming
-  //#define ASSISTED_TRAMMING_MENU_ITEM
+  #define RESTORE_LEVELING_AFTER_G35    // Enable to restore leveling setup after operation
+  //#define REPORT_TRAMMING_MM          // Report Z deviation (mm) for each point relative to the first
+  //#define ASSISTED_TRAMMING_MENU_ITEM // Add a menu item for Assisted Tramming
 
   /**
    * Screw thread:

Marlin/src/gcode/bedlevel/G35.cpp

              " ", (screw_thread & 1) == (adjust > 0) ? "CCW" : "CW",
              " by ", abs(full_turns), " turns");
       if (minutes) SERIAL_ECHOPAIR(" and ", abs(minutes), " minutes");
+      if (ENABLED(REPORT_TRAMMING_MM)) SERIAL_ECHOPAIR(" (", -diff, "mm)");
       SERIAL_EOL();
     }
   }