Fix ics20 tests for port router refactor

[colin-axner]

Summary

During the rebase to main, @damiannolan mentioned that the ics20 tests need to be refactored, I believe he was talking about the following:

• msg_server_test.go
• relay_test.go

I'm unsure if there's something else. Please chime in @damiannolan when you are back :)

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[DimitrisJim]

yet another refactor oh god where's my lolcry emoji

[colin-axner]

Since the port router work is either being upstreamed directly or moving directly onto eureka, this issue is no longer relevant