Load every workload once per tick into a map instead of a per-container
GetWorkloadByID (N+1) in the upsert loop plus a second ListWorkloads in
the plugin pass: one query per tick, zero GetWorkloadByID. The
ListWorkloads error path returns before the missing-sweep so a failed
load can't flip live container rows to 'missing'.
image.Reconcile is now a no-op: the generic upsert+markMissing pass
already syncs every labeled container's state from the single
ListAllForReconciler (docker ps -a) snapshot earlier in the same tick,
so the former per-container IsContainerRunning loop was N redundant
Docker calls/tick. (Its no-op body sits in image.go, which landed with
the preceding commit; the tests are here.) compose/static reconcile do
non-redundant work and are intentionally untouched.
Reviewed: go APPROVE.
alexei.dolgolyov
5c17885197