Fix metrics server network address in scenario
What does this MR do and why?
This change makes sure we bind the metrics servers to all network interfaces. They bind to lo
by default, which means other containers cannot reach them.
I also reverted the change that maps ports to the Docker host. This is not necessary since the application and test containers run on the same Docker network. It's also not good practice since something else may be running on the CI runner on these ports.
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