[IMPROVED] Reduce lock contention in saveClosedClient #8003

Job	Run time
Lint	1m 20s
Build (Minimum Go)	46s
Build (Minimum Go, windows-2022)	50s
Build (Minimum Go, windows-2025)	52s
Build (Latest Go)	35s
Test JetStream Cluster 2	9m 4s
Test JetStream Consumers	5m 4s
Test JetStream Cluster 3	10m 7s
Test Raft	6m 41s
Test JetStream Cluster 1	11m 11s
Test JetStream	12m 8s
Test Stores	8m 21s
Test Message Tracing	2m 38s
Test Other Packages	5m 56s
Test JetStream Supercluster	7m 12s
Test No-Race 2	4m 19s
Test MQTT	3m 1s
Test Remaining Server Tests	9m 13s
Test JetStream Cluster 4	10m 45s
Test No-Race 1	6m 10s
Test JWT	5m 21s
	2h 1m 34s

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