Allow float XY probe offsets

Responding to #12383

XY probe offsets should be integers because adding decimal points makes the code larger. But if decimals are very much wanted, this commit removes the old restriction.

Marlin/src/core/utility.cpp

     #if HAS_BED_PROBE
       SERIAL_ECHOPGM("Probe Offset X:" STRINGIFY(X_PROBE_OFFSET_FROM_EXTRUDER) " Y:" STRINGIFY(Y_PROBE_OFFSET_FROM_EXTRUDER));
       SERIAL_ECHOPAIR(" Z:", zprobe_zoffset);
-      #if X_PROBE_OFFSET_FROM_EXTRUDER > 0
+      if ((X_PROBE_OFFSET_FROM_EXTRUDER) > 0)
         SERIAL_ECHOPGM(" (Right");
-      #elif X_PROBE_OFFSET_FROM_EXTRUDER < 0
+      else if ((X_PROBE_OFFSET_FROM_EXTRUDER) < 0)
         SERIAL_ECHOPGM(" (Left");
-      #elif Y_PROBE_OFFSET_FROM_EXTRUDER != 0
+      else if ((Y_PROBE_OFFSET_FROM_EXTRUDER) != 0)
         SERIAL_ECHOPGM(" (Middle");
-      #else
+      else
         SERIAL_ECHOPGM(" (Aligned With");
-      #endif
-      #if Y_PROBE_OFFSET_FROM_EXTRUDER > 0
+
+      if ((Y_PROBE_OFFSET_FROM_EXTRUDER) > 0) {
         #if IS_SCARA
           SERIAL_ECHOPGM("-Distal");
         #else
           SERIAL_ECHOPGM("-Back");
         #endif
-      #elif Y_PROBE_OFFSET_FROM_EXTRUDER < 0
+      }
+      else if ((Y_PROBE_OFFSET_FROM_EXTRUDER) < 0) {
         #if IS_SCARA
           SERIAL_ECHOPGM("-Proximal");
         #else
           SERIAL_ECHOPGM("-Front");
         #endif
-      #elif X_PROBE_OFFSET_FROM_EXTRUDER != 0
+      }
+      else if ((X_PROBE_OFFSET_FROM_EXTRUDER) != 0)
         SERIAL_ECHOPGM("-Center");
-      #endif
+
       if (zprobe_zoffset < 0)
         SERIAL_ECHOPGM(" & Below");
       else if (zprobe_zoffset > 0)

Marlin/src/inc/SanityCheck.h

     #error "Z_PROBE_LOW_POINT must be less than or equal to 0."
   #endif
 
-  static_assert(int(X_PROBE_OFFSET_FROM_EXTRUDER) == (X_PROBE_OFFSET_FROM_EXTRUDER), "X_PROBE_OFFSET_FROM_EXTRUDER must be an integer value.");
-  static_assert(int(Y_PROBE_OFFSET_FROM_EXTRUDER) == (Y_PROBE_OFFSET_FROM_EXTRUDER), "Y_PROBE_OFFSET_FROM_EXTRUDER must be an integer value.");
-
 #else
 
   /**