refactor(srp): narrow generic native policy key seams

managed/XCEngine.ScriptCore/Rendering/Core/ScriptableRenderPipelineAsset.cs

@@ -58,52 +58,6 @@ namespace XCEngine.Rendering
             return UsesNativeCameraFramePlanBaseline();
         }
 
-        protected virtual string GetRenderSceneSetupPolicyAssetKey()
-        {
-            return string.Empty;
-        }
-
-        protected virtual string
-            GetRenderSceneSetupPolicyAssetKeyContextual(
-                int rendererIndex)
-        {
-            return GetRenderSceneSetupPolicyAssetKey();
-        }
-
-        protected virtual string GetCameraFrameStandalonePassAssetKey(
-            CameraFrameStage stage)
-        {
-            return string.Empty;
-        }
-
-        protected virtual string
-            GetCameraFrameStandalonePassAssetKeyContextual(
-                CameraFrameStage stage,
-                int rendererIndex)
-        {
-            return GetCameraFrameStandalonePassAssetKey(
-                stage);
-        }
-
-        protected virtual string
-            GetDirectionalShadowPlanningPolicyAssetKey()
-        {
-            return string.Empty;
-        }
-
-        protected virtual string
-            GetDirectionalShadowExecutionPolicyAssetKey()
-        {
-            return string.Empty;
-        }
-
-        protected virtual string
-            GetDirectionalShadowExecutionPolicyAssetKeyContextual(
-                int rendererIndex)
-        {
-            return GetDirectionalShadowExecutionPolicyAssetKey();
-        }
-
         protected virtual void ReleaseRuntimeResources()
         {
         }