Dashboard listen logging doesn't work with dynamic port

[JamesNK]

Dashboard logs the endpoint configuration, not the final port. That means if a dynamic port is specified - 0 - then 0 is logged instead of the assigned port.

2024-02-21T09:44:23.6935833 info: Aspire.Dashboard[0]
      Now listening on: https://localhost:0/
2024-02-21T09:44:23.7048955 info: Aspire.Dashboard[0]
      OTLP server running at: http://localhost:0/

Logging needs to move to after Kestrel has started and the port is assigned.