Update codecov config to support commenting in PR

Add missing directory fixing go.etcd.io/etcd/etcdutl/v3/::etcdutl/

Reference:
- #18131

Signed-off-by: Chun-Hung Tseng <[email protected]>

codecov.yml

@@ -1,16 +1,32 @@
 ---
+# https://docs.codecov.com/docs/codecovyml-reference
 codecov:
   token: 6040de41-c073-4d6f-bbf8-d89256ef31e1
   disable_default_path_fixes: true
+  require_ci_to_pass: no
+  notify:
+    wait_for_ci: no
 fixes:
   - go.etcd.io/etcd/api/v3/::api/
   - go.etcd.io/etcd/client/v3/::client/v3/
   - go.etcd.io/etcd/client/v2/::client/v2/
   - go.etcd.io/etcd/etcdctl/v3/::etcdctl/
+  - go.etcd.io/etcd/etcdutl/v3/::etcdutl/
   - go.etcd.io/etcd/pkg/v3/::pkg/
   - go.etcd.io/etcd/server/v3/::server/
 ignore:
   - '**/*.pb.go'
   - '**/*.pb.gw.go'
   - tests/**/*
   - go.etcd.io/etcd/tests/**/*
+coverage:
+  range: 60..80
+  round: down
+  precision: 2
+comment:
+  layout: "header, files, diff"
+  behavior: default
+  require_changes: false        # if true: only post the comment if coverage changes
+  require_base: false           # [true :: must have a base report to post]
+  require_head: true            # [true :: must have a head report to post]
+  hide_project_coverage: false  # [true :: only show coverage on the git diff]