Add an acceptance test for slowlogs.Recorder.

Implementation guide

The following discussion from !1112 (merged) should be addressed:

• @vshushlin started a discussion:

  suggestion (non-blocking)/follow-up: I noticed that we don't have any acceptance tests for slowlogs.Recorder. It would be nice to have a single acceptance test that just verifies that we log timing for specific cases. And that test should fail if you add a new call to slowlogs.Recorder without editing the test.