[FIX] website: store default menu tree (apps menu) for new website

Previously, for multi-websites it was decided that:
  - creating a new website would not get already existing apps menu (shop,
    blog, forum..).
  - installing a new app would create the app's menu on existing website

This was decided mostly for technical reason but it is a weird behavior.

This commit saves the installed apps menus in order to copy them on new website
If this default menu got deleted, we ensure a minimalist tree menu for new
website

Note: This also fixes the bug where installing a website_module more than once
(with -i website_module in command line) would create the menu (blog, shop,
forum..) on the first website a second time.

This was because the website.menu.create() overrided in website would
return the last created record in the self loop, thus the last one created
would be the one set to the xml_id (ir.model.data).

This commit closes #27253

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