ClientTestSetup sets up zap test logging, intercepts HTTP requests using gock, and creates a context with the zap logger embedded.

GockLogObserver returns a gock.ObserverFunc that logs HTTP requests to a zap Logger.

LoadTestData is a helper to load test data from a `testdata` directory relaive to the CWD.

TestLogger returns a zap Logger that logs all messages to the given testing.TB.