lib: remove use of Debug.MakeMirror()

This paves the way for removing `vm.runInDebugContext()`.  Inspection
of Map and Set iterators is now done through V8 instrinsics.

Fixes: https://github.com/nodejs/node/issues/11875
PR-URL: https://github.com/nodejs/node/pull/13295


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Robert Jefe Lindstaedt <robert.lindstaedt@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>