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Sometimes gossiper operations invoked from storage_service and other components run under a non-gossiper scheduling group. If these operations acquire gossiper locks, priority inversion can occur: higher-priority gossiper tasks may wait behind lower-priority tasks (e.g. streaming), which can cause gossiper slowness or even failures. This patch ensures that gossiper operations requiring locks on gossiper structures are explicitly executed in the gossiper scheduling group. To help detect similar issues in the future, a warning is logged whenever a gossiper lock is acquired under a non-gossiper scheduling group. Fixes scylladb/scylladb#25907 Refs: scylladb/scylladb#25702 Backport: this patch fixes an issue with gossiper operations scheduling group, that might affect topology operations, therefore backport is needed to 2025.1, 2025.2, 2025.3 Closes scylladb/scylladb#25981 * https://github.com/scylladb/scylladb: gossiper: ensure gossiper operations are executed in gossiper scheduling group gossiper: fix wrong gossiper instance used in `force_remove_endpoint`