Tweak tests, consolidate pins target validation (#21254)

buildroot/share/PlatformIO/scripts/common-dependencies-post.py

@@ -1,16 +0,0 @@
-#
-# common-dependencies-post.py
-# Convenience script to add build flags for Marlin Enabled Features
-#
-
-Import("env")
-Import("projenv")
-
-def apply_board_build_flags():
-	if not 'BOARD_CUSTOM_BUILD_FLAGS' in env['MARLIN_FEATURES']:
-		return
-	projenv.Append(CCFLAGS=env['MARLIN_FEATURES']['BOARD_CUSTOM_BUILD_FLAGS'].split())
-
-# We need to add the board build flags in a post script
-# so the platform build script doesn't overwrite the custom CCFLAGS
-apply_board_build_flags()