InfluxDB 2: Cannot find owner of Dashboard

Nobody has claimed this yet.

```bash
# Create Dashboard
--> POST http://127.0.0.1:9999/api/v2/dashboards
--> {
"orgID": "cf6cf88984580114",
"name": "dashboard1605172054649-IT",
"description": "coolest dashboard"
}
<-- 201 Created http://127.0.0.1:9999/api/v2/dashboards

### Find owners
--> GET http://127.0.0.1:9999/api/v2/dashboards/069aeccba6663000/owners
<-- 200 OK http://127.0.0.1:9999/api/v2/dashboards/069aeccba6663000/owners
<-- {
"links": {
"self": "/api/v2/dashboards/069aeccba6663000/owners"
},
"users": []
}
```

__Steps to reproduce:__
List the minimal actions needed to reproduce the behavior.

1. Create Dashboard
2. List owners of Dashboard

__Expected behavior:__
Return list with owner - user who created the dashboard

__Actual behavior:__
Return empty list.

__Environment info:__

* InfluxDB version: InfluxDB v2 nightly from 2020-11-12

Reproduce the POST /api/v2/dashboards request followed by GET /api/v2/dashboards/{id}/owners against the reported InfluxDB version. Trace the dashboard creation and owners API paths, then verify that the response includes the user who created the dashboard while preserving the existing links and response shape.

Written by the indexing model from the issue text.