[Schema] Add missing `id` to Actions (#5813)

Fixes #5703

schemas/src/actions/Action.json

@@ -12,6 +12,10 @@
 			"description": "Optional icon to be shown on the action in conjunction with the title. Supports data URI in version 1.2+",
 			"version": "1.1"
 		},
+		"id": {
+			"type": "string",
+			"description": "A unique identifier associated with this Action."
+		},
 		"style": {
 			"type": "ActionStyle",
 			"description": "Controls the style of an Action, which influences how the action is displayed, spoken, etc.",
@@ -28,4 +32,4 @@
 			"version": "1.5"
 		}
 	}
-}
+}