Do not run Copilot review on drafts or on every push

Copilot review credits are limited; reviewers can trigger a review by hand
when one is wanted.

Author: borisstoyanov

.asf.yaml

@@ -40,5 +40,5 @@ github:
 
   copilot_code_review:
     enabled: true
-    review_drafts: true
-    review_on_push: true
+    review_drafts: false
+    review_on_push: false