🔨 Creality v4 with STM32 HAL (#21999)

- New STM32 env for Creality V4 boards.
- Separate Libmaple targets into their own `ini` file.
- Temporarily remove unusable targets from `pins.h`.

Co-authored-by: ellensp <ellensp@hotmsil.com>
Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/pins/stm32f1/env_validate.h

@@ -21,6 +21,6 @@
  */
 #pragma once
 
-#if NOT_TARGET(__STM32F1__)
+#if NOT_TARGET(__STM32F1__, STM32F1)
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
 #endif