planner/stepper: simplify ultralcd.h include into lcd.h

[gudnimg]

Move UserECoolEnabled() from ultralcd.cpp into eeprom.cpp since this function has nothing to do with LCD specifically.
To avoid including Prusa_farm.h into epprom.cpp, simply replace farm_mode variable by reading the farm mode from EEPROM directly. This change allows us to remove FarmOrUserECool() function.

The goal is to avoid including ultralcd.h in general since it is a nightmare to unit test as is. Including lcd.h is less of a problem than ultralcd.h

---

TODO:

• Unify SILENT_MODE_* and TMC2130_MODE_* preprocessor symbols. From EEPROM perspective these are the same.

Something like this:

// On TMC2130 printers we have either Normal or Stealth mode.
// On non-TMC2130 printers we have Normal (Power), Stealth (Silent), and Auto mode.
enum StepperMode : uint8_t {
  NORMAL = 0,
  STEALTH = 1,
  AUTO = 2,
};

[github-actions]

All values in bytes. Δ Delta to base

Target	ΔFlash	ΔSRAM	Used Flash	Used SRAM	Free Flash	Free SRAM
MK3S_MULTILANG	-92	-1	247644	5652	6308	2540
MK3_MULTILANG	-102	-1	246948	5661	7004	2531

[gudnimg]

I opened another can of worms. Marking as draft for now :) Need to review and do some further cleanup

[gudnimg]

I will split this PR into two. The changes to the stealth mode caching need to be reviewed thoroughly. I will open a separate PR with only the changes to stealth mode when I find time.