roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20815619?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/20815619?buildTab=artifacts#/tpccbench/nodes=3/cpu=16/lease=expiration) on master @ [a76eb5de5d3fdeb4f1276eefe5fdb11e6ebe53a4](https://github.com/cockroachdb/cockroach/commits/a76eb5de5d3fdeb4f1276eefe5fdb11e6ebe53a4):

```
test tpccbench/nodes=3/cpu=16/lease=expiration failed: (test_runner.go:990).func4: in provider: ibm: failed to configure IBM Cloud account: failed to get or create transit gateway: failed to get transit gateways: Internal Server Error [owner=test-eng]
```

Parameters:
- cloud=ibm
- coverageBuild=false
- cpu=16
- 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-57523

Start with the linked TeamCity failure and artifacts, then read pkg/cmd/roachtest/README.md. Trace the IBM provider path reported near test_runner.go:990 and determine whether the transit-gateway error is reproducible or external. Done means the cluster_creation roachtest no longer fails for this IBM configuration, with the failure mode covered or clearly documented.

Written by the indexing model from the issue text.