cli: investigate why TestZipJobTrace does not work with a shared process virtual cluster

**Describe the problem**

When running the test with a shared process virtual cluster:
```
zip_test.go:980:
Error Trace: /Users/herko/go/src/github.com/cockroachdb/cockroach/pkg/cli/zip_test.go:980
Error: Expect "" to match "/jobs/911187579317649409/.*/trace.zip
/jobs/911187579333214209/.*/trace.zip
"
Test: TestZipJobTrace
```

**How to reproduce**

Set the following in `TestServerArgs` to force a shared process tenant and cause the failure to happen.
```
DefaultTestTenant: base.SharedTestTenantAlwaysEnabled,
```

**Expected behavior**
The test should pass when running with a shared process virtual cluster, unless after investigation the test is expected not to work with one.

Ref: https://github.com/cockroachdb/cockroach/issues/112857
Epic CRDB-38970

Jira issue: CRDB-32688

Start with TestZipJobTrace in pkg/cli/zip_test.go around line 980, reproducing it with DefaultTestTenant set to base.SharedTestTenantAlwaysEnabled. Trace why the shared process virtual cluster produces no matching trace paths, then determine whether the test should support that configuration or explicitly not. Done means the expected behavior is documented and the test passes or has a justified expectation.

Written by the indexing model from the issue text.