chore(replication): guard convergence across leader failover

[yordis]

• Replication parity needs a live convergence signal across leader loss and reconnection before the TCP path can be retired with confidence.

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[cursor]

PR Summary

Low Risk
Changes are limited to integration test coverage and timeouts; no production replication or forwarding logic is modified.

Overview
Extends the long-running gRPC forwarding failover integration test so it verifies replication convergence, not just successful appends through a surviving follower.

After each write phase, the test now reads the stream on every cluster node and asserts matching revision sequences ([0,1], then [0,1,2]). It also restarts the former leader after failover, waits for a full three-node topology again, and re-checks parity across all nodes. New AssertRevisions / ReadRevisions helpers poll gRPC reads with retries on transient Unavailable/DeadlineExceeded errors.

Scenario and test timeouts are increased (7–8 minutes) to cover the longer leader-loss plus reconnection path. The test method is renamed to replicates_writes_across_leader_loss_and_reconnection.

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Reviewing files that changed from the base of the PR and between 56eb784 and 57f527f.

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• src/EventStore.Core.Tests/Integration/grpc_request_forwarding_survives_leader_change.cs

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