roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20555031?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20555031?buildTab=artifacts#/ycsb/E/nodes=3/cpu=32/uniform) on master @ [71a8a9b411fb1d260ef5b4e79a414515ce22e5ca](https://github.com/cockroachdb/cockroach/commits/71a8a9b411fb1d260ef5b4e79a414515ce22e5ca):

```
test ycsb/E/nodes=3/cpu=32/uniform failed: (test_runner.go:876).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-55095

Read pkg/cmd/roachtest/README.md, then inspect test_runner.go around line 876 and the cluster_creation test path. Reproduce the IBM ycsb/E configuration with cpu=32 and determine why it is rejected. Done means the reported configuration is handled correctly and the affected roachtest passes or the limitation is clearly documented.

Written by the indexing model from the issue text.