hack: integrate logcheck into golangci-lint

Running logcheck as part of golangci-lint has several advantages:
- faster checking because finding files and parsing is shared
  with other linters
- gets rid of the complex and buggy
  hack/verify-structured-logging.sh (https://github.com/kubernetes/kubernetes/issues/106746)
- support for // nolint:logcheck
- works with Go 1.18

hack/verify-golangci-lint.sh

@@ -36,14 +36,25 @@ PATH="${GOBIN}:${PATH}"
 export GO111MODULE=on
 
 # Install golangci-lint
-echo 'installing golangci-lint '
+echo "installing golangci-lint and logcheck plugin from hack/tools into ${GOBIN}"
 pushd "${KUBE_ROOT}/hack/tools" >/dev/null
   go install github.com/golangci/golangci-lint/cmd/golangci-lint
+  go build -o "${GOBIN}/logcheck.so" -buildmode=plugin k8s.io/klog/hack/tools/logcheck/plugin
 popd >/dev/null
 
 cd "${KUBE_ROOT}"
 
-# The config is in ${KUBE_ROOT}/.golangci.yaml
+# The config is in ${KUBE_ROOT}/.golangci.yaml where it will be found
+# even when golangci-lint is invoked in a sub-directory.
+#
+# The logcheck plugin currently has to be configured via env variables
+# (https://github.com/golangci/golangci-lint/issues/1512).
+#
+# Remember to clean the golangci-lint cache when changing
+# the configuration and running this script multiple times,
+# otherwise golangci-lint will report stale results:
+# _output/local/bin/golangci-lint cache clean
+export LOGCHECK_CONFIG="${KUBE_ROOT}/hack/logcheck.conf"
 echo 'running golangci-lint ' >&2
 res=0
 if [[ "$#" -gt 0 ]]; then