workspaceAnimation: Don't exclude minimized windows

workspaceAnimation: Don't exclude minimized windows

We may be switching workspaces because we are focusing a window
that is located on a different workspace.

In case that new focus window was minimized, it currently just pops
up out of nowhere after the animation, as we are only tracking windows
that are visible at the beginning of the transition.

To fix this, don't exclude minimized windows from tracking, but hide
them until they are unminimized.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4199>
(cherry picked from commit 620efa31cd2669ef22e6dc24f2a5dca70918ff57)