In #1537, determine_the_origin() changed to take
`Optional<URL::URL> const&` as first parameter, but it's passed
`Web::Fetch::Infrastructure::Response::url()`, which returns
`Optional<URL::URL const&>`. Ladybird does not have
SerenityOS/serenity#22870 (yet?), so this mismatch silently creates
a copy.
Change determine_the_origin() to take `Optional<URL::URL const&>`
instead. No behavior change, saves a copy, and is probably what
was originally intended.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
Now that the heap has no knowledge about a JavaScript realm and is
purely for managing the memory of the heap, it does not make sense
to name this function to say that it is a non-realm variant.
The main motivation behind this is to remove JS specifics of the Realm
from the implementation of the Heap.
As a side effect of this change, this is a bit nicer to read than the
previous approach, and in my opinion, also makes it a little more clear
that this method is specific to a JavaScript Realm.
