refactor: move firmware workspace under firmware

firmware/libs/kaptan-config-derive/tests/ui/duplicate_id.rs

@@ -0,0 +1,11 @@
+use kaptan_config_derive::ConfigValidate;
+
+#[derive(ConfigValidate)]
+struct DuplicateId {
+    #[config(id = 7, nonzero)]
+    first: u32,
+    #[config(id = 7, nonzero)]
+    second: u32,
+}
+
+fn main() {}