[2.0.x] Make MIN_PROBE_EDGE a general option (for electronic probes) (#10069)

Some probes don't work near the edges of the bed. This change promotes MIN_PROBE_EDGE to a general setting that applies to all probing functions.

Marlin/src/config/examples/delta/kossel_pro/Configuration.h

@@ -789,6 +789,9 @@
  * not giving someone a head crash. Use something like G29 Z-0.2 to adjust as needed.
  */
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -17.25  // Increase this if the first layer is too thin (remember: it's a negative number so increase means closer to zero).
+// Certain types of probes need to stay away from edges
+#define MIN_PROBE_EDGE 10
+
 // X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
@@ -1084,8 +1087,6 @@
   #define GRID_MAX_POINTS_X 7
   #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
 
-  // The Z probe minimum outer margin (to validate G29 parameters).
-  #define MIN_PROBE_EDGE 10
 
   #define LEFT_PROBE_BED_POSITION -(DELTA_PROBEABLE_RADIUS)
   #define RIGHT_PROBE_BED_POSITION DELTA_PROBEABLE_RADIUS
@@ -1132,7 +1133,7 @@
 
   //#define MESH_EDIT_GFX_OVERLAY   // Display a graphics overlay while editing the mesh
 
-  #define MESH_INSET 1              // Mesh inset margin on print area
+  #define MESH_INSET 1              // Set Mesh bounds as an inset region of the bed
   #define GRID_MAX_POINTS_X 10      // Don't use more than 15 points per axis, implementation limited.
   #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
 
@@ -1157,7 +1158,7 @@
   //=================================== Mesh ==================================
   //===========================================================================
 
-  #define MESH_INSET 10          // Mesh inset margin on print area
+  #define MESH_INSET 10          // Set Mesh bounds as an inset region of the bed
   #define GRID_MAX_POINTS_X 3    // Don't use more than 7 points per axis, implementation limited.
   #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X