[IMP] packaging: add a new install type for windows

In order to be able to use #86723 Odoo needs to be used as a local
proxy. With this commit, a new install type `Local Proxy Mode` is added
to the windows installer. When chosen, this install type does not
install the PostgreSQL server and it adds the `hw_l10n_eg_eta` as a
server wide module. It also generate and sets a proxy token.

While at it, the windows packaging is a bit improved:
* the VM now uses the virtio drivers
* the installer size and speed is improved

X-original-commit: 8586f78af36616d8014caf7ec9e44d8f6549d10d
Part-of: odoo/odoo#92195