release-26.2.0-rc: pkg/upgrade/upgrademanager/upgrademanager_test: TestMigrationFailure failed

pkg/upgrade/upgrademanager/upgrademanager_test.TestMigrationFailure [failed](https://mesolite.cluster.engflow.com/invocations/default/7b90bdb0-e619-4d0b-bd1d-458949686964?testReportRun=2&testReportShard=1&testReportAttempt=1#targets-Ly9wa2cvdXBncmFkZS91cGdyYWRlbWFuYWdlcjp1cGdyYWRlbWFuYWdlcl90ZXN0) on release-26.2.0-rc @ [3d2773444f3ed07326a5daf43bc1555457d6964b](https://github.com/cockroachdb/cockroach/commits/3d2773444f3ed07326a5daf43bc1555457d6964b):

```
=== RUN TestMigrationFailure
test_log_scope.go:172: test logs captured to: outputs.zip/logTestMigrationFailure507824694
test_log_scope.go:82: use -show-logs to present logs inline
manager_external_test.go:857: test will fail at version: 26.2
test_server_shim.go:638: DRPC is enabled (via testserver factory defaults)
```

Parameters:
- attempt=1
- race=true
- run=2
- shard=1
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

/cc @cockroachdb/release-eng @cockroachdb/release-eng

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Jira issue: CRDB-63702