Allow metadata in service call data (#66672)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>
Co-authored-by: Erik <erik@montnemery.com>

homeassistant/helpers/config_validation.py

@@ -1058,6 +1058,8 @@ SERVICE_SCHEMA = vol.All(
             ),
             vol.Optional(CONF_ENTITY_ID): comp_entity_ids,
             vol.Optional(CONF_TARGET): vol.Any(TARGET_SERVICE_FIELDS, dynamic_template),
+            # The frontend stores data here. Don't use in core.
+            vol.Remove("metadata"): dict,
         }
     ),
     has_at_least_one_key(CONF_SERVICE, CONF_SERVICE_TEMPLATE),

tests/helpers/test_config_validation.py

@@ -410,10 +410,16 @@ def test_service_schema():
             "entity_id": "all",
             "alias": "turn on kitchen lights",
         },
+        {"service": "scene.turn_on", "metadata": {}},
     )
     for value in options:
         cv.SERVICE_SCHEMA(value)
 
+    # Check metadata is removed from the validated output
+    assert cv.SERVICE_SCHEMA({"service": "scene.turn_on", "metadata": {}}) == {
+        "service": "scene.turn_on"
+    }
+
 
 def test_entity_service_schema():
     """Test make_entity_service_schema validation."""