Joharrington/managed network outbound rule operations fix (Azure#28975)

* remove public property

* rerun tests

---------

Co-authored-by: Josh Harrington <joharrington@microsoft.com>

Author: joshharrin

sdk/ml/azure-ai-ml/azure/ai/ml/_ml_client.py

@@ -297,7 +297,7 @@ def __init__(
             **app_insights_handler_kwargs,
         )
 
-        self._workspace_outbound_rule = WorkspaceOutboundRuleOperations(
+        self._workspace_outbound_rules = WorkspaceOutboundRuleOperations(
             self._operation_scope,
             self._rp_service_client,
             self._operation_container,
@@ -562,14 +562,6 @@ def workspaces(self) -> WorkspaceOperations:
         """
         return self._workspaces
 
-    @property
-    def workspace_outbound_rule(self) -> WorkspaceOutboundRuleOperations:
-        """A collection of workspace managed network outbound rule related operations.
-        :return: Workspace Outbound Rule operations
-        :rtype: WorkspaceOutboundRuleOperations
-        """
-        return self._workspace_outbound_rule
-
     @property
     @experimental
     def registries(self) -> RegistryOperations: