roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20472135?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20472135?buildTab=artifacts#/kv95/enc=false/nodes=3/cpu=32/size=64kb/splt=100) on release-25.3 @ [23650649e32a75faed83576b7b54821e5590d4ad](https://github.com/cockroachdb/cockroach/commits/23650649e32a75faed83576b7b54821e5590d4ad):

```
test kv95/enc=false/nodes=3/cpu=32/size=64kb/splt=100 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-54494

Start with the failure at test_runner.go:850 and the roachtest README in pkg/cmd/roachtest/README.md. Review the linked TeamCity log and artifacts for the IBM cluster_creation run, then trace how the kv95 configuration accepts cpu=32. Done means the IBM roachtest no longer rejects this configuration and the relevant test run passes.

Written by the indexing model from the issue text.