Deprecate QueryState::for_each_unchecked (#10815)

# Objective

Resolves Issue #10772.

## Solution

Added the deprecated warning for QueryState::for_each_unchecked, as
noted in the comments of PR #6773.
Followed the wording in the deprecation messages for `for_each` and
`for_each_mut`

crates/bevy_ecs/src/query/state.rs

@@ -1040,6 +1040,10 @@ impl<Q: WorldQueryData, F: WorldQueryFilter> QueryState<Q, F> {
     /// This does not check for mutable query correctness. To be safe, make sure mutable queries
     /// have unique access to the components they query.
     #[inline]
+    #[deprecated(
+        since = "0.13.0",
+        note = "QueryState::for_each_unchecked was not idiomatic Rust and has been moved to query.iter_unchecked_manual().for_each()"
+    )]
     pub unsafe fn for_each_unchecked<'w, FN: FnMut(Q::Item<'w>)>(
         &mut self,
         world: UnsafeWorldCell<'w>,