itest: remove manual channel closures from route blinding tests

[ellemouton]

The itest framework now handles the closure of any channels opened during the test and so we dont need to manually close them. The manual closure code in the route blinding tests were resulting in the occasional test flake.

(I've lost the link to the build where I saw the flake since I triggered a re-run of the individual test 🙈 )

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[bitromortac]

The itest framework now handles the closure of any channels opened during the test and so we dont need to manually close them.

I think that's not the case anymore since the standby nodes were removed and all nodes are just shut down without closing channels (haven't seen any code that would close channels, channel closes also don't appear in logs). Still a good change I'd say because we just spin up new nodes for each test and this change saves time. LGTM ⚡!

[ziggie1984]

LGTM

[ziggie1984]

Let's maybe remove this code everywhere where we coop close and do not want to test the closing of channels ?

[ellemouton]

cc @guggero for override merge 🙏