gh-35056: Make automatic codecov report less noisy

    
Fixes #35016. ~We *turn off automatic codecov comment.*~

~After this PR, someone needs to implement a github action that sends
code coverage information as a quiet comment, like the current built-
documentation comment.~
    
URL: #35056
Reported by: Kwankyu Lee
Reviewer(s): Tobias Diez

.codecov.yml

@@ -0,0 +1,15 @@
+# https://docs.codecov.com/docs/pull-request-comments#disable-comment
+comment: false
+# https://docs.codecov.com/docs/commit-status
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 0%
+        base: auto
+    patch:
+      default:
+        target: auto
+        threshold: 0%
+        base: auto