ccl/multiregionccl: TestMrSystemDatabaseUpgrade failed [OOM]

ccl/multiregionccl.TestMrSystemDatabaseUpgrade [failed](https://mesolite.cluster.engflow.com/invocations/default/611de2fa-4dca-4a52-8770-c44440113beb?testReportRun=3&testReportShard=9&testReportAttempt=1#targets-Ly9wa2cvY2NsL211bHRpcmVnaW9uY2NsOm11bHRpcmVnaW9uY2NsX3Rlc3Q=) on master @ [6705820f72616f3831584e69e2f5d0abc6f6ff83](https://github.com/cockroachdb/cockroach/commits/6705820f72616f3831584e69e2f5d0abc6f6ff83):

```
=== RUN TestMrSystemDatabaseUpgrade
test_log_scope.go:172: test logs captured to: outputs.zip/logTestMrSystemDatabaseUpgrade3151629598
test_log_scope.go:82: use -show-logs to present logs inline
test_server_shim.go:95: cluster virtualization disabled due to issue: #156308 (expected label: C-test-failure)
test_server_shim.go:637: DRPC is enabled (via testserver factory defaults)
```

Parameters:
- attempt=1
- race=true
- run=3
- shard=9
Help

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

[Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-68042

Start with ccl/multiregionccl.TestMrSystemDatabaseUpgrade and the linked Mesolite test report, using the recorded race=true, run=3, and shard=9 parameters. Inspect the captured test logs and investigate the reported OOM; done means the test completes successfully without exhausting memory.

Written by the indexing model from the issue text.