cockroachdb / cockroachdb/cockroach

server: investigate why TestStatusVarsTxnMetrics does not work with a shared process virtual cluster

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A-multitenancy C-investigation T-db-server
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Description

**Describe the problem**

When running `TestStatusVarsTxnMetrics` with a shared process virtual cluster the expected result does not always contain the tenant label. There are discrepancies between external and shared processes for this test in the expected results.

**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-32691

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