Deprecate manually passing entity ids to template entities (#39382)

It is no longer necessary to provide a list of entities to monitor
to the template platforms.

The template is now re-evaluated whenever
a referenced entity changes state, and new entities are automaticlly
discovered.

Automatic analysis can now determine the entities for all templates
without the need for manual setup.

homeassistant/components/template/binary_sensor.py

@@ -36,20 +36,25 @@ CONF_DELAY_ON = "delay_on"
 CONF_DELAY_OFF = "delay_off"
 CONF_ATTRIBUTE_TEMPLATES = "attribute_templates"
 
-SENSOR_SCHEMA = vol.Schema(
-    {
-        vol.Required(CONF_VALUE_TEMPLATE): cv.template,
-        vol.Optional(CONF_ICON_TEMPLATE): cv.template,
-        vol.Optional(CONF_ENTITY_PICTURE_TEMPLATE): cv.template,
-        vol.Optional(CONF_AVAILABILITY_TEMPLATE): cv.template,
-        vol.Optional(CONF_ATTRIBUTE_TEMPLATES): vol.Schema({cv.string: cv.template}),
-        vol.Optional(ATTR_FRIENDLY_NAME): cv.string,
-        vol.Optional(ATTR_ENTITY_ID): cv.entity_ids,
-        vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
-        vol.Optional(CONF_DELAY_ON): cv.positive_time_period,
-        vol.Optional(CONF_DELAY_OFF): cv.positive_time_period,
-        vol.Optional(CONF_UNIQUE_ID): cv.string,
-    }
+SENSOR_SCHEMA = vol.All(
+    cv.deprecated(ATTR_ENTITY_ID),
+    vol.Schema(
+        {
+            vol.Required(CONF_VALUE_TEMPLATE): cv.template,
+            vol.Optional(CONF_ICON_TEMPLATE): cv.template,
+            vol.Optional(CONF_ENTITY_PICTURE_TEMPLATE): cv.template,
+            vol.Optional(CONF_AVAILABILITY_TEMPLATE): cv.template,
+            vol.Optional(CONF_ATTRIBUTE_TEMPLATES): vol.Schema(
+                {cv.string: cv.template}
+            ),
+            vol.Optional(ATTR_FRIENDLY_NAME): cv.string,
+            vol.Optional(ATTR_ENTITY_ID): cv.entity_ids,
+            vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
+            vol.Optional(CONF_DELAY_ON): cv.positive_time_period,
+            vol.Optional(CONF_DELAY_OFF): cv.positive_time_period,
+            vol.Optional(CONF_UNIQUE_ID): cv.string,
+        }
+    ),
 )
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(