Dashboard is unavailable when High Availability mode is enabled for an instance

### Current Behavior

After enabling High Availability mode, a dashboard is not available anymore:
* "Dashboard" button is greyed out
* direct access to a dashboard via URL is not possible - page hangs on "loading" animation

### Expected Behavior

Dashboard should be available when Hosted Instance is running on High Availability mode.

### Steps To Reproduce

1. Create a new Hosted Instance
2. While creating an instance, select the `Multi-User Dashboard for Ticket/Task Management` dashboard
3. Once the Hosted Instance is up and running, enable High Availability mode in the instance's settings (`Settings -> High Availability -> Enable HA Mode`
4. Once the instance is restarted, try accessing the dashboard via URL

### Environment

- FlowFuse version: FlowFuse Cloud
- Node.js version:
- npm version:
- Platform/OS: MacOS
- Browser: Safari

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate