chore: migrate PR-2812 remove animator requirement (#2872)

* Do not require component Animator on NetworkAnimator.

* update

Adding changelog entry.

---------

Co-authored-by: jeffgamedev <jbrooks@gala.games>
Co-authored-by: Jeff Brooks <jeph.brooks@gmail.com>

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -32,6 +32,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Changed
 
+- Changed `NetworkAnimator` no longer requires the `Animator` component to exist on the same `GameObject`. (#2872)
 - Changed `NetworkTransform` to now use `NetworkTransformMessage` as opposed to named messages for NetworkTransformState updates. (#2810)
 - Changed `CustomMessageManager` so it no longer attempts to register or "unregister" a null or empty string and will log an error if this condition occurs. (#2807)
 

com.unity.netcode.gameobjects/Components/NetworkAnimator.cs

@@ -164,7 +164,6 @@ namespace Unity.Netcode.Components
     /// NetworkAnimator enables remote synchronization of <see cref="UnityEngine.Animator"/> state for on network objects.
     /// </summary>
     [AddComponentMenu("Netcode/Network Animator")]
-    [RequireComponent(typeof(Animator))]
     public class NetworkAnimator : NetworkBehaviour, ISerializationCallbackReceiver
     {
         [Serializable]