take jetpack_ai_enabled into consideration, don't waste cycles if use…

…r has disabled it. Respond with default payload

projects/plugins/jetpack/_inc/lib/class-jetpack-ai-helper.php

@@ -424,6 +424,11 @@ public static function get_ai_assistance_feature() {
 			return $cache;
 		}
 
+		if ( ! apply_filters( 'jetpack_ai_enabled', true ) ) {
+			// if user has disabled AI, don't waste request/computing cycles and return default payload.
+			return self::get_default_feature_payload();
+		}
+
 		if ( null !== static::$ai_assistant_failed_request ) {
 			return static::$ai_assistant_failed_request;
 		}