The fallback to "any of the added sets" needs to be applied after
they've all been added, rather than with every added one. Otherwise, in
flows that expect a particular difficulty to be selected in the end
(such as exiting from editor) would end up switching away from the
edited beatmap.
As described in #24248, the workaround employed by
`GlobalActionContainer`, wherein it tried to handle actions with
priority before its children by being placed in front of the children
and not _actually containing_ said children, is blocking the resolution
of some rather major input handling issues that allow key releases to be
received by deparented drawables.
To resolve, migrate `GlobalActionContainer` to use `Prioritised`, which
can be done without regressing certain mouse button flows after
ppy/osu-framework#5966.