plasma: handle ksycoca5 better

- Remove xdg-desktop-menu-dummy.menu kbuildsycoca5. Not sure why we
  need it but it is a pretty big failure if it exists.
  See issue #56176.

- plasma: clear ksycoca cache before building

  This is needed to pick up on software removed since the last cache
  update. Otherwise it hangs around as zombies forever (or until the
  cache is cleared).

- Add the above + the icon cache cleanup to plasmaSetup

  This will be run for the logged in user on each nixos-rebuild.
  Unfortunately this only works if you are managing software through
  nixos-rebuild (nix-env users need to run this manually, otherwise
  log out and log back in).

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