roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20831069?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20831069?buildTab=artifacts#/ycsb/C/nodes=3/cpu=32/uniform) on release-25.3 @ [af086b26ba4ffeab051b8a423b07ee46a508d194](https://github.com/cockroachdb/cockroach/commits/af086b26ba4ffeab051b8a423b07ee46a508d194):

```
test ycsb/C/nodes=3/cpu=32/uniform failed: (test_runner.go:850).func4: invalid number of cpus 32 for IBM [owner=test-eng]
```

Parameters:
- cloud=ibm
- coverageBuild=false
- cpu=32
- runtimeAssertionsBuild=false
- 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)

/cc @cockroachdb/test-eng

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

Jira issue: CRDB-57627

Start with the failing roachtest report and the error at test_runner.go:850, then read the roachtest README and the linked artifacts for the IBM configuration. The work is done when the cluster_creation test no longer rejects the reported IBM CPU configuration and the relevant nightly test passes.

Written by the indexing model from the issue text.