[FIX] sale_management,account_invoicing: proper uninstall

Previous to this commit, installing sale_managmenet/account_invoicing
would add some menu items for the `sale/account` module
(which contains all the logic for the sale/accounting flow)
and it would also install sale/account since it's a dependency, however,
horror would strike if one were to go and uninstall
sale_management/account_invoicing: nothing happens!

This is because these "facade" modules don't actually install anything, and
uninstalling an app does not force the uninstallation of its
dependencies, thus the `sale/account` module would stay installed, along with
the views introduced by the "facade" module.

To fix this, we create an uninstall_hook which forces the removal of
the ir.ui.menus that the "facade" modules introduce, so that the
functionality remains (for modules that depend on it) but it's not
user-accessible (because it should only be accessible to users if the
facade module is installed).

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