roachtest: backup/ceph/reef/plain failed

**Note:** This build has runtime assertions enabled. If the same failure was hit in a run without assertions enabled, there should be a similar failure without this message. If there isn't one, then this failure is likely due to an assertion violation or (assertion) timeout.

roachtest.backup/ceph/reef/plain [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21335253?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21335253?buildTab=artifacts#/backup/ceph/reef/plain) on release-25.4.10-rc @ [a1989021dd825212349c067edcd07a77597c0781](https://github.com/cockroachdb/cockroach/commits/a1989021dd825212349c067edcd07a77597c0781):

```
(cluster.go:2501).Run: full command output in run_063900.581948121_n4_sudo-snap-install-mi.log: COMMAND_PROBLEM: exit status 1
test artifacts and logs in: /artifacts/backup/ceph/reef/plain/run_1
```

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=4
- encrypted=true
- metamorphicBufferedSender=true
- metamorphicLeases=default
- runtimeAssertionsBuild=true
- ssd=0
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-21335253/backup-ceph-reef-plain/1777703926355/1777704137104)

Same failure on other branches

- #169602 roachtest: backup/ceph/reef/plain failed [B-runtime-assertions-enabled C-test-failure O-roachtest O-robot T-field-eng branch-release-25.2 release-blocker]
- #169598 roachtest: backup/ceph/reef/plain failed [B-runtime-assertions-enabled C-test-failure O-roachtest O-robot T-field-eng branch-release-24.3 release-blocker]

/cc @cockroachdb/field-engineering

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*backup/ceph/reef/plain.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-63558