tools: remove eslint rule no-let-in-for-declaration
In continue our discussion in https://github.com/nodejs/node/pull/26562#discussion_r264024305
cc @targos @ZYSzys @trott @BridgeAR
Maybe still add a label don't land on 6.x
though the last 6.x release has been drafted.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines