arti-relay: remove 'override_net_params' config

opararequested to merge
opara/arti:relay-bin-3 into main

We think that for relays, the 'override_net_params' config option is overly broad and a footgun. We can always re-add this back later if we want to, but for now the focus will be on exposing specific config options for features that are okay to be changed by users.

/cc @jnewsome

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