tools: disable Codecov commit statuses

We don't want (yet?) to consider coverage as a requirement for
landing a pull request.

Refs: #47285 (comment)
Refs: https://docs.codecov.com/docs/commit-status#disabling-a-status
PR-URL: #47306
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

codecov.yml

@@ -12,3 +12,8 @@ codecov:
   notify:
     # Wait for all coverage builds:
     after_n_builds: 2
+
+coverage:
+  status:
+    project: off
+    patch: off