release-25.4: workloadccl/allccl: enable test tenants

[DarrylWong]

This is a cherry-pick of #156309, which we want to stop the timeout flakes seen in #155305, specifically the logic which skips the test under duress.

Epic: None
Fixes: #155305
Release note: None
Release Justification: unit test only change

[blathers-crl]

Thanks for opening a backport.

Before merging, please confirm that the change does not break backwards compatibility and otherwise complies with the backport policy. Include a brief release justification in the PR description explaining why the backport is appropriate. All backports must be reviewed by the TL for the owning area. While the stricter LTS policy does not yet apply, please exercise judgment and consider gating non-critical changes behind a disabled-by-default feature flag when appropriate.

[cockroach-teamcity]

This change is