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Get rid of the now unneeded code for nested checkboxes
Open, Needs TriagePublic

Description

Filetype selection used to be nested, but it's not anymore (see below screenshot of the new flat structure)
There's some leftover code (mostly search/NestedCheckboxMulti(select|option)Widget.js) that we no longer need & don't want to maintain for no reason, so let's get rid of that.