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804ef7a3fb
Right now, connlib hands out a `BiMap` of sentinel IPs <> upstream servers whenever it emits a `TunInterfaceUpdated` event. This `BiMap` internally uses two `HashMap`s. The iteration order of `HashMap`s is non-deterministic and therefore, we lose the order in which the upstream / system resolvers have been passed to us originally. To prevent that, we now emit a dedicated `DnsMapping` type that does not expose its internal data structure but only getters for retrieving the sentinel and upstream servers. Internally, it uses a `Vec` to store this mapping and thus retains the original order. This is asserted as part of our proptests by comparing the resulting `Vec`s. This fix is preceded by a few refactorings that encapsulate the code for creating and updating this DNS mapping. Resolves: #8439