Remove unsound Clone impl for EntityMutExcept (#17032)

# Objective

`EntityMutExcept` can currently be cloned, which can easily violate
aliasing rules.

## Solution

- Remove the `Clone` impl for `EntityMutExcept`
- Also manually derived `Clone` impl for `EntityRefExcept` so that `B:
Clone` isn't required, and also impl'd `Copy`

## Testing

Compile failure tests would be good for this, but I'm not exactly sure
how to set that up.

## Migration Guide

- `EntityMutExcept` can no-longer be cloned, as this violates Rust's
memory safety rules.

crates/bevy_ecs/src/world/entity_ref.rs

@@ -3435,7 +3435,6 @@ pub enum TryFromFilteredError {
 
 /// Provides read-only access to a single entity and all its components, save
 /// for an explicitly-enumerated set.
-#[derive(Clone)]
 pub struct EntityRefExcept<'w, B>
 where
     B: Bundle,
@@ -3521,6 +3520,14 @@ where
     }
 }
 
+impl<B: Bundle> Clone for EntityRefExcept<'_, B> {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<B: Bundle> Copy for EntityRefExcept<'_, B> {}
+
 impl<B: Bundle> PartialEq for EntityRefExcept<'_, B> {
     fn eq(&self, other: &Self) -> bool {
         self.entity() == other.entity()
@@ -3567,7 +3574,6 @@ unsafe impl<B: Bundle> TrustedEntityBorrow for EntityRefExcept<'_, B> {}
 /// queries that might match entities that this query also matches. If you don't
 /// need access to all components, prefer a standard query with a
 /// [`crate::query::Without`] filter.
-#[derive(Clone)]
 pub struct EntityMutExcept<'w, B>
 where
     B: Bundle,