[FIX] website: set inherit_id on child COW for view validation

Before this commit:
1. If a view A is being inherited by a view B and C and the view C is doing an
   xpath on B (but inherit A), then copying the tree to make it specific would
   crash.
   Indeed, when copying C, the view inheritance check (while doing the xml
   check) would break since C would be tested against the generic tree and not
   the new specific tree.
2. If a generic view being written with a website_id in the context had already
   a specific child, we would copy both its specific child and generic child
   for the same key instead of simply copying the specific one.
   This happens if we triggered previously a COW on a child view, then only
   that view had been made specific (and is still in the generic tree).
   Then, when cloning the parent, we need to copy and make specific all the
   hierarchy but ignore the generic elements if they already have a specific
   one.

Now:
1. Fixed with adding the inherit_id on the copy vals
2. Fixed with filtering children_ids with filter_duplicate() before cloning the
   children tree

opw-1908308
Closes #27914

closes odoo/odoo#28405

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