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

[NoahShomette]

Objective

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

[MrGVSV]

LGTM!

Hopefully, with something like #6971 we can start working on ways to remove these kinds of unexpected footguns.