This method now allows you to pass in a custom registry. The registry
isn't used yet for callers, since we don't support scoped registries.
However, as we now pass in the registry to `Node::clone`, we set the
registry when creating elements and cloning them.
As such, various tests start passing where we set the registry. Some
tests started failing, but they rely on scoped registries which we don't
support yet. These tests thus flipped: those that were erroneously
failing are now passing and vice versa.
Part of #34319
Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
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