[ICS24] Remove default value and implementation for PortId

[Farhad-Shabani]

Problem Statement

In our ics24_host codebase implementation, it is not appropriate to have a default value and implementation for the PortId.
The sole purpose of this default value is for testing. It functions correctly for local unit tests, but when we traverse through the router, our router exclusively accepts the transfer PortId as valid. For this, even for testing purposes, it is better to utilize transfer value to ensure more comprehensive and meaningful test coverage.

Proposal

Remove default value and implementation for PortId