feat: add configurable retention period for Redis usage queue

- Introduced `redis-usage-queue-retention-seconds` config parameter with a default of 60 seconds and a max of 3600 seconds.
- Updated logic in `redisqueue` to honor configurable retention periods for enqueued usage data.
- Modified config validation and initialization to support and enforce retention limits.
- Enhanced change tracking in `config_diff` to detect updates to this parameter.

cmd/server/main.go

@@ -418,6 +418,7 @@ func main() {
 		}
 	}
 	redisqueue.SetUsageStatisticsEnabled(cfg.UsageStatisticsEnabled)
+	redisqueue.SetRetentionSeconds(cfg.RedisUsageQueueRetentionSeconds)
 	coreauth.SetQuotaCooldownDisabled(cfg.DisableCooling)
 
 	if err = logging.ConfigureLogOutput(cfg); err != nil {