Tweak tests, consolidate pins target validation (#21254)

buildroot/tests/STM32F407VE_black

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+#
+# Build tests for STM32F407VET6
+#
+
+# exit on first failure
+set -e
+
+restore_configs
+use_example_configs STM32/Black_STM32F407VET6
+opt_enable BAUD_RATE_GCODE
+exec_test $1 $2 "Full-featured Sample Black STM32F407VET6 config" "$3"
+
+# cleanup
+restore_configs