Saves 128 bytes in testing with `mftest mega 1 -y`

If the IDEX mode was previously set (via GCode or the LCD Panel) to a duplication mode...   It was lost after a G28 due to this redundant setting of 'extruder_duplication_enabled'. 

It is very important to the various use cases of IDEX machines that extruder_duplication_enabled is preserved across a G28.   The reason is this allows a person to use the LCD Panel to put the machine into a duplication mode, and then send a 'normal' part file to the printer and get two parts out of the process.

Arduino doesn't (always) support `float` formatting in strings. So either cast to `int` or use `dtostrf()` to fix these usages.

- Use the return value from probe_pt during `G34`
  Eliminate the assumption that probe_pt leaves current_position set to values relative to the probed points. This is not always true, depending on the raise_after argument.
- Add '`E`' argument to `G34` command allowing stowing between each probe.

queue.buffer is in bss area, start_free_memory starts from heap then above of bss

- Revert "Fix FIX_MOUNTED_PROBE compile error (#14393)"
- Revert "Fix G28 with non-BLTouch probes (#14381)"
- Revert "Fix BLTOUCH deploy/stow in HS mode (#14352)"
- Revert "Apply needed BLTouch patch (#14233)"

Co-Authored-By: AnHardt <github@kitelab.de>