itest: add test where faraday/loop/pool is running in remote mode

[guggero]

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With https://github.com/lightninglabs/lightning-terminal/pull/294 we added integration tests for the two main operating modes of lnd-mode=integrated and lnd-mode=remote. But we didn't add any tests for the case where one of the other integrated daemons is running in remote mode (for example loop-mode=remote).

[guggero]

Additional note: We should also add some basic read/write permission checks when implementing this to make sure the super macaroon conversion works as expected.