v0.10.4: fix CI by unwiring the test-lifecycle from the Testcontainers targets

Fixes CI, which had been red since v0.10.2.

- The v0.10.2 test-lifecycle wrapper started the installer dev-stack (make
  restart) before every make test* target, including the make test-coverage that
  CI runs. That stack needs wireguard secrets CI does not have, so its config
  check failed and the whole run went red. Removed the wrapper from the
  Testcontainers targets (make test, make test-unit, make test-integration, make
  test-coverage, make test-api, make test-real); they stand up their own
  containers and need no local stack, which is what lets CI run them. make
  test-installed, which drives the live installer stack, keeps the
  reset/start/stop lifecycle and stays a local-only target.