Refs #4374
- otelNoIdentity: name journaldUnits so the fixture trips the store-
identity path it's testing instead of swarm-otel's unrelated
journald-safety assertion (an empty list with log collection on is
refused as "collect everything", not "collect nothing").
- otelNoStores: give it a bao client identity. The secret gate moved
from deployCfg.authelia.enable to a real client cert/key pair, so a
fixture meaning "no telemetry stores" now needs its own secret
identity to keep exercising the exporter/authenticator wiring it
was written for.
- docs/swarm/secrets.md: two vale fixes — a contraction, and drop a
condescending "simply".