False positive for httptest.ResponseRecorder

[pellared]

Currently the linter expect closing the Body of http.Response returned by httptest.ResponseRecorder.Result().

Notice that closing is needed only when using http.Client.
For sure it is not needed when using httptest.ResponseRecorder as even closing the response body is a no-op.
See: https://github.com/golang/go/blob/86bec1ec198f2720c83bd232a72b800b4ea5a9f6/src/net/http/httptest/recorder.go#L200-L204

Tested with https://github.com/golangci/golangci-lint/releases/tag/v1.59.1 and https://github.com/open-telemetry/opentelemetry-go-contrib.
PR for reference: open-telemetry/opentelemetry-go-contrib#5962