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5dac4b38fb
This change introduces a targeted test that simulates the gossiper race condition observed during node decommissioning. The test delays gossip state application and host ID lookup to reliably reproduce the scenario where `gossiper::get_host_id()` is called on a removed endpoint, potentially triggering an abort in `apply_new_states`. There is a specific error injection added to widen the race window, in order to increase the likelihood of hitting the race condition. The error injection is designed to delay the application of gossip state updates, for the specific node that is being decommissioned. This should then result in the server abort in the gossiper. Refs: scylladb/scylladb#25621 Fixes: scylladb/scylladb#25721 Backport: The test is primarily for an issue found in 2025.1, so it needs to be backported to all the 2025.x branches. Closes scylladb/scylladb#25685