release-25.4: testcluster: assign unique ClusterName#157947

blathers-crl[bot] wants to merge 1 commit intorelease-25.4cockroachdb/cockroach:release-25.4from

blathers/backport-release-25.4-157868cockroachdb/cockroach:blathers/backport-release-25.4-157868Copy head branch name to clipboard