What

Update the test to take advantage of !17532 (merged)

Why

We want to rely on the octez-client to interact with the tezos compatible l2 node as much as possible

Add a path to the sequencer endpoint, and use the hook to save the output.

Test has been update

dune exec etherlink/tezt/tests/main.exe -- tezlink describe

Note that the warning for /protocols is not present for the second output (ie when pointing the client to /tezlink)