[FIX] website: handle COW'd views during module install/update

Since multi-website, we COW (copy on write) views when editing a view on a
website.
This is causing 2 issues related to module install/update:
1. During a module install, when creating an inherited view, it will create
   that view as expected on the generic tree.
   But that generic tree may not be used on website(s). Indeed, if the view
   was edited, we are now using a copy of the view instead of the original
   XML view (with an xml_id).
   That copied view won't get the new inherited view in its view tree.
   Now, we correctly copy the new view under every specific view tree (if
   exists).
2. During a module update, when updating a view, it will only update the view
   having the xml_id, so the generic one.
   But most of the time, the generic view is not used as it was usually COW'd
   and the specific view now replace the generic one.
   Now, we also apply the update on the COW'd view. Note that only unmodified
   field will be updated, this behavior basically mimic the noupdate behavior
   on view's ir.model.data.

Step to reproduce for bug 1:
  - Install website_sale module
  - Go to a product page and then enter edit mode
  - Make a modification to trigger COW, eg edit the information area under the
    price "30-day money-back guarantee".
  - Now install website_sale_comparison module
  - The product page won't have the comparison button as the comparison view
    inheriting the product view was created on the generic tree and not copied
    on the specific tree (COW'd before the comparison module install).

Step to reproduce for bug 2:
  - Repeat first 3 steps of bug 1
  - Now make a modification in a view from the XML file in
    website_sale_comparison module and update the module
  - Only the view with the xml_id is updated, not it's COW'd views. This mean
    that only the generic view is updated and not the specific one(s) really
    used on the website.

task-1920487

closes odoo/odoo#29956

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