release-26.3: roachtest: backup/ceph/squid/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/squid/plain [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21409236?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21409236?buildTab=artifacts#/backup/ceph/squid/plain) on release-26.3 @ [b5fef9728df4a1d990cde1a06059de1af489b5b1](https://github.com/cockroachdb/cockroach/commits/b5fef9728df4a1d990cde1a06059de1af489b5b1):

Failed with:

```
(cluster.go:2816).Run: full command output in run_082611.668285167_n4_tmpcephInitsh.log: COMMAND_PROBLEM: exit status 1
test artifacts and logs in: /artifacts/backup/ceph/squid/plain/cpu_arch=fips/run_1
```
Cluster Node to Ip Mapping:
| Node | Public IP | Private IP |
| --- | --- | --- |
| teamcity-21409236-1782977241-16-n4cpu4-0001 | 34.74.158.14 | 10.142.2.244 |
| teamcity-21409236-1782977241-16-n4cpu4-0002 | 34.74.143.125 | 10.142.2.243 |
| teamcity-21409236-1782977241-16-n4cpu4-0003 | 34.138.127.237 | 10.142.2.247 |
| teamcity-21409236-1782977241-16-n4cpu4-0004 | 35.190.168.146 | 10.142.15.210 |

Parameters:
- arch=fips
- cloud=gce
- coverageBuild=false
- cpu=4
- diskCount=0
- encrypted=false
- metamorphicDRPC=true
- metamorphicLeases=epoch
- metamorphicWriteBuffering=true
- runtimeAssertionsBuild=true
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-21409236/backup-ceph-squid-plain/1782980726014/1782981014421)

See: [Datadog Logs](https://us5.datadoghq.com/logs?query=service%3Aroachtest+%40cluster%3Ateamcity-21409236-1782977241-16-n4cpu4&from_ts=1782980726014&to_ts=1782981014421&live=false&storage=flex_tier)

/cc @cockroachlabs/field-engineering

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*backup/ceph/squid/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-65361

Start with the linked TeamCity run, its run_082611.668285167_n4_tmpcephInitsh.log output, and the artifacts under /artifacts/backup/ceph/squid/plain/cpu_arch=fips/run_1. Read pkg/cmd/roachtest/README.md for the investigation workflow, then use the Grafana and Datadog links to identify the failure cause; done means the failure is explained and a validated fix or infrastructure diagnosis is recorded.

Written by the indexing model from the issue text.