release-26.2.7-rc: roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21497652?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21497652?buildTab=artifacts#/acceptance/gossip/restart-node-one) on release-26.2.7-rc @ [b1582e0a72ed7f3813a4346a2ddce2d9a29c30c2](https://github.com/cockroachdb/cockroach/commits/b1582e0a72ed7f3813a4346a2ddce2d9a29c30c2):

```
test acceptance/gossip/restart-node-one failed: (test_runner.go:1027).func4: failed to retrieve authorized keys from gcloud: read SSH keys from gs://roachprod-ssh-keys-crl-e2e-infra/ssh-keys: googleapi: got HTTP response code 403 with body: AccessDeniedAccess denied.teamcity-nightly@cockroach-ephemeral.iam.gserviceaccount.com does not have storage.objects.get access to the Google Cloud Storage object. Permission 'storage.objects.get' denied on resource '//storage.googleapis.com/projects/_/buckets/roachprod-ssh-keys-crl-e2e-infra/objects/ssh-keys' (or it may not exist). [owner=test-eng]
```

Parameters:
- cloud=aws
- coverageBuild=false
- cpu=4
- diskCount=0
- runtimeAssertionsBuild=false
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)

Same failure on other branches

- #174641 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.17-rc]
- #174639 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.24-rc]
- #174597 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174596 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174595 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174594 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174593 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174592 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174591 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]
- #174589 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-master]

/cc @cockroachlabs/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-67839

Start with the roachtest README and the failure at test_runner.go:1027 for acceptance/gossip/restart-node-one. Review the linked TeamCity logs and artifacts, then investigate the reported 403 while reading the GCS ssh-keys object; done means the cluster_creation roachtest no longer fails for this access error across the affected branches.

Written by the indexing model from the issue text.