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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`

71393 of 86433 relevant lines covered (82.6%)

318817.24 hits per line

Coverage Regressions

Lines Coverage ∆ File
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79.52
-1.58% src/github.com/nats-io/nats-server/server/raft.go
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83.09
-0.12% src/github.com/nats-io/nats-server/server/jetstream_cluster.go
17
87.6
-0.31% src/github.com/nats-io/nats-server/server/consumer.go
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81.38
0.28% src/github.com/nats-io/nats-server/server/memstore.go
8
86.08
-0.08% src/github.com/nats-io/nats-server/server/stream.go
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0.13% src/github.com/nats-io/nats-server/server/jetstream_api.go
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93.03
-0.02% src/github.com/nats-io/nats-server/server/client.go
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78.13
0.02% src/github.com/nats-io/nats-server/server/filestore.go
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84.59
0.05% src/github.com/nats-io/nats-server/server/route.go
3
88.53
-0.08% src/github.com/nats-io/nats-server/server/mqtt.go
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77.79
0.1% src/github.com/nats-io/nats-server/server/opts.go
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86.28
0.1% src/github.com/nats-io/nats-server/server/accounts.go
1
86.63
0.04% src/github.com/nats-io/nats-server/server/monitor.go
Jobs
ID Job ID Ran Files Coverage
1 40451939845.1 66
82.6
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Source Files on build 40451939845