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coverage: 81.241% (-1.3%) from 82.588%
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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`

70219 of 86433 relevant lines covered (81.24%)

333210.1 hits per line

Coverage Regressions

Lines Coverage ∆ File
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-13.99% src/github.com/nats-io/nats-server/server/opts.go
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-21.89% src/github.com/nats-io/nats-server/server/msgtrace.go
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-6.2% src/github.com/nats-io/nats-server/server/reload.go
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-1.78% src/github.com/nats-io/nats-server/server/client.go
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-7.0% src/github.com/nats-io/nats-server/server/parser.go
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-0.72% src/github.com/nats-io/nats-server/server/stream.go
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-1.02% src/github.com/nats-io/nats-server/server/server.go
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-0.26% src/github.com/nats-io/nats-server/server/consumer.go
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-0.42% src/github.com/nats-io/nats-server/server/accounts.go
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0.1% src/github.com/nats-io/nats-server/server/jetstream_cluster.go
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-0.36% src/github.com/nats-io/nats-server/server/events.go
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0.28% src/github.com/nats-io/nats-server/server/memstore.go
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-11.32% src/github.com/nats-io/nats-server/server/signal.go
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-0.76% src/github.com/nats-io/nats-server/server/auth.go
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-5.66% src/github.com/nats-io/nats-server/server/log.go
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-4.65% src/github.com/nats-io/nats-server/server/jwt.go
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-0.03% src/github.com/nats-io/nats-server/server/jetstream_api.go
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-0.72% src/github.com/nats-io/nats-server/server/jetstream_batching.go
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-0.11% src/github.com/nats-io/nats-server/server/monitor.go
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0.06% src/github.com/nats-io/nats-server/server/filestore.go
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-0.48% src/github.com/nats-io/nats-server/server/avl/seqset.go
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-1.56% src/github.com/nats-io/nats-server/server/errors.go
Jobs
ID Job ID Ran Files Coverage
1 41169718451.1 66
81.24
GitHub Action Run
Source Files on build 41169718451