Add needed_services[].use_host_ports

[thomas-riccardi]

Useful to force disable host_port when a service is used as a dependency, and still keep this available when that service is directly started; for example a frontend, also started as a dependency of the backend, to support front, back, and both-together development modes.

Add useless host_port and use_host_ports usage in test/*/dmake.yml to cover that part.

This doesn't properly cover all edge cases regarding NeededService specialization: we assume all instances for a service that are otherwise identical are using the same value for use_host_ports. It's undefined behavior to not do that.

Also improve test/*/.dockerignore for faster tests.

[sonarcloud[bot]]

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