Follow-up to SERVER-134664, which added default-verbosity LOGV2 lines when a query is rejected by maxEstimatedScanBytes (unbounded COLLSCAN exceeding the configured threshold).

The new log lines are emitted on every rejection without rate limiting, so a burst of rejected queries against one or more large collections can spam the mongod log.

Rate-limit these rejection log lines using logv2::SeveritySuppressor (or logv2::KeyedSeveritySuppressor keyed by namespace, so each offending namespace is logged once per time window).