Update Codecov.io configuration (#33783)

codecov.yml

@@ -6,14 +6,4 @@ coverage:
       default:
         target: 90
         threshold: 0.09
-  notify:
-    # Notify codecov room in Discord. The webhook URL (encrypted below) ends in /slack which is why we configure a Slack notification.
-    slack:
-      default:
-        url: "secret:TgWDUM4Jw0w7wMJxuxNF/yhSOHglIo1fGwInJnRLEVPy2P2aLimkoK1mtKCowH5TFw+baUXVXT3eAqefbdvIuM8BjRR4aRji95C6CYyD0QHy4N8i7nn1SQkWDPpS8IthYTg07rUDF7s5guurkKv2RrgoCdnnqjAMSzHoExMOF7xUmblMdhBTWJgBpWEhASJy85w/xxjlsE1xoTkzeJu9Q67pTXtRcn+5kb5/vIzPSYg="
-comment:
-  require_changes: true
-  layout: reach
-  branches:
-    - master
-    - !dev
+comment: false