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[FIXED] Remove stale JetStream account usage after peer removal (#8570)

Fixes #8563.

When a JetStream server is permanently removed from the cluster, its
last reported account usage can remain in `jsAccount.rusage`. Because
that value is still included in the account totals, replacing a stream
replica on another server can cause storage usage to be counted twice.

I reproduced this with a 4-node cluster and an R3 stream. After removing
one of the replica-holding servers and letting the stream move to the
spare node, the stream was still correctly running with 3 replicas, but
the account storage usage increased as if there were 4 copies.

This change removes the departed server's usage when its meta peer
removal is committed. It also ignores a late usage update from the
removed node so that the stale entry cannot be added back after cleanup.

I added a regression test that:

* creates an R3 stream on a 4-node cluster,
* verifies the initial account usage,
* removes one of the servers hosting a replica,
* waits for the replica to move to the spare server,
* verifies the account usage stays unchanged,
* and checks that a late usage update from the removed peer does not
recreate the stale entry.

Testing:

* new regression test passes repeatedly
* regression test passes with `-race`
* related peer-removal and account-usage tests pass
* `go vet ./server`
* `git diff --check`

70615 of 86433 relevant lines covered (81.7%)

329482.0 hits per line

Coverage Regressions

Lines Coverage ∆ File
62
78.13
 -0.41% src/github.com/nats-io/nats-server/server/filestore.go
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 -0.18% src/github.com/nats-io/nats-server/server/jetstream_cluster.go
27
78.14
 -0.11% src/github.com/nats-io/nats-server/server/raft.go
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86.16
 0.32% src/github.com/nats-io/nats-server/server/stream.go
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93.52
 0.05% src/github.com/nats-io/nats-server/server/gateway.go
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74.0
 0.33% src/github.com/nats-io/nats-server/server/jetstream_api.go
5
55.36
 -0.35% src/github.com/nats-io/nats-server/server/jetstream_errors_generated.go
5
89.27
 -0.04% src/github.com/nats-io/nats-server/server/leafnode.go
4
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 0.13% src/github.com/nats-io/nats-server/server/consumer.go
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 -0.07% src/github.com/nats-io/nats-server/server/monitor.go
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 0.71% src/github.com/nats-io/nats-server/server/events.go
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 0.45% src/github.com/nats-io/nats-server/server/opts.go
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 2.51% src/github.com/nats-io/nats-server/server/route.go
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92.42
 2.34% src/github.com/nats-io/nats-server/server/client.go
Jobs
ID Job ID Ran Files Coverage
1 35308254883.1 66
81.7
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Source Files on build 35308254883