roachtest: backup-restore/round-trip 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-restore/round-trip [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21352180?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyGceBazel/21352180?buildTab=artifacts#/backup-restore/round-trip) on release-26.1 @ [5f8c30f174a1765be61f2008d3f8f43d8c9433c2](https://github.com/cockroachdb/cockroach/commits/5f8c30f174a1765be61f2008d3f8f43d8c9433c2):

Failed with:

```
(monitor.go:267).Wait: monitor failure: backup 1_round-trip-test-backup_cluster: restored system table system.comments is missing a row: ["comment from the RSW","{SENTINEL}",5,3]
test artifacts and logs in: /artifacts/backup-restore/round-trip/run_1
```
Cluster Node to Ip Mapping:
| Node | Public IP | Private IP |
| --- | --- | --- |
| teamcity-21352180-1779174269-13-n4cpu4-0001 | 35.237.205.239 | 10.142.2.169 |
| teamcity-21352180-1779174269-13-n4cpu4-0002 | 35.231.188.140 | 10.142.2.165 |
| teamcity-21352180-1779174269-13-n4cpu4-0003 | 35.190.150.201 | 10.142.2.172 |
| teamcity-21352180-1779174269-13-n4cpu4-0004 | 35.231.137.210 | 10.142.0.185 |

Parameters:
- arch=amd64
- cloud=gce
- coverageBuild=false
- cpu=4
- diskCount=0
- encrypted=true
- 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-21352180/backup-restore-round-trip/1779174928788/1779177444079)

Same failure on other branches

- #166504 roachtest: backup-restore/round-trip failed [A-disaster-recovery B-runtime-assertions-enabled C-test-failure O-roachtest O-robot T-sql-foundations branch-master]

/cc @cockroachdb/disaster-recovery

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

Jira issue: CRDB-64047