Fix Box<dyn Reflect> struct with a hashmap in it panicking when clone_value is called on it (#8184)

# Objective

- Fix the issue described in #8183: Box<dyn Reflect> structs with a
hashmap in them will panic when clone_value is called on it
- Fixes: #8183

## Solution

- Updates the implementation of Reflect for Hashmaps to make clone_value
call from_reflect on the key before inserting it into the new struct

crates/bevy_reflect/src/impls/std.rs

@@ -399,7 +399,10 @@ macro_rules! impl_reflect_for_hashmap {
                 let mut dynamic_map = DynamicMap::default();
                 dynamic_map.set_name(self.type_name().to_string());
                 for (k, v) in self {
-                    dynamic_map.insert_boxed(k.clone_value(), v.clone_value());
+                    let key = K::from_reflect(k).unwrap_or_else(|| {
+                        panic!("Attempted to clone invalid key of type {}.", k.type_name())
+                    });
+                    dynamic_map.insert_boxed(Box::new(key), v.clone_value());
                 }
                 dynamic_map
             }