Show dashboard link on Remote instances when dashboard-2 is installed

### Description

Same as this the request : [Show dashboard link on instances when dashboard-2 is installed](https://github.com/FlowFuse/flowfuse/pull/3652)

Would like the option to be able to remotely acces the REmote Instance Dashboard, trough the FloweFuse platform

- Probably require som changes on the DeviceAgent to support this.
- Adding the button to the Remote Instance UI in FlowFuse are most likely implemented the same way as IN the pullrequest 3652.


### Which customers would this be available to

Everyone - CE/Starter/Team/Enterprise

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

I am not a FlowFuse team member