Joseph Doherty 4fa0be2281 feat: add JetStreamClusterFixture for multi-node cluster tests (Go parity) ...

Adds a unified JetStreamClusterFixture consolidating the capabilities of all 7
per-suite fixtures (ClusterFormationFixture, ClusterStreamFixture, LeaderFailoverFixture, etc.)
into a single reusable helper for Tasks 6-10. Includes new Go-parity helpers
(WaitOnStreamLeaderAsync, WaitOnConsumerLeaderAsync, GetConsumerLeaderId,
StepDownMetaLeader, SimulateNodeRestart, RemoveNode) matching jetstream_helpers_test.go.
27 smoke tests verify all capabilities pass.

2026-02-24 07:36:32 -05:00

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