Enable-WriteCore-feature-for-fleet (Azure#46462)

* Enable-WriteCore-feature-for-fleet

* regen

* Update assets.json

* Update Azure.ResourceManager.ContainerServiceFleet.netstandard2.0.cs

Author: welovej

sdk/fleet/Azure.ResourceManager.ContainerServiceFleet/CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Add AutoUpgrade and AutoUpgradeProfile support
 - Enable the new model serialization by using the System.ClientModel, refer this [document](https://aka.ms/azsdk/net/mrw) for more details.
+- Exposed `JsonModelWriteCore` for model serialization procedure.
 
 ## 1.0.0 (2023-12-13)
 

sdk/fleet/Azure.ResourceManager.ContainerServiceFleet/api/Azure.ResourceManager.ContainerServiceFleet.netstandard2.0.cs

@@ -2,5 +2,5 @@
   "AssetsRepo": "Azure/azure-sdk-assets",
   "AssetsRepoPrefixPath": "net",
   "TagPrefix": "net/fleet/Azure.ResourceManager.ContainerServiceFleet",
-  "Tag": "net/fleet/Azure.ResourceManager.ContainerServiceFleet_f0519a638f"
+  "Tag": "net/fleet/Azure.ResourceManager.ContainerServiceFleet_ae53422e8e"
 }