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coverage: 82.614% (+6.0%) from 76.659%
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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`

71406 of 86433 relevant lines covered (82.61%)

332766.04 hits per line

Coverage Regressions

Lines Coverage ∆ File
68
82.82
-0.16% src/github.com/nats-io/nats-server/server/jetstream_cluster.go
25
80.64
2.93% src/github.com/nats-io/nats-server/server/raft.go
14
87.45
-0.18% src/github.com/nats-io/nats-server/server/consumer.go
6
86.18
0.75% src/github.com/nats-io/nats-server/server/stream.go
5
84.59
-0.05% src/github.com/nats-io/nats-server/server/jetstream.go
5
77.77
15.47% src/github.com/nats-io/nats-server/server/opts.go
4
78.14
0.19% src/github.com/nats-io/nats-server/server/filestore.go
4
73.95
0.66% src/github.com/nats-io/nats-server/server/jetstream_api.go
4
89.48
3.71% src/github.com/nats-io/nats-server/server/leafnode.go
1
92.93
3.9% src/github.com/nats-io/nats-server/server/client.go
1
93.52
0.43% src/github.com/nats-io/nats-server/server/gateway.go
Jobs
ID Job ID Ran Files Coverage
1 34930159813.1 66
82.61
GitHub Action Run
Source Files on build 34930159813