🔨 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>

buildroot/share/PlatformIO/scripts/mks_encrypt.py

@@ -2,9 +2,9 @@
 # buildroot/share/PlatformIO/scripts/mks_encrypt.py
 #
 # Apply encryption and save as 'build.firmware' for these environments:
-#  - env:mks_robin_stm32
+#  - env:mks_robin
 #  - env:flsun_hispeedv1
-#  - env:mks_robin_nano35_stm32
+#  - env:mks_robin_nano35
 #
 Import("env")