LibJS: Replace GlobalObject with VM in Intl AOs [Part 1/19]

Instead of passing a GlobalObject everywhere, we will simply pass a VM,
from which we can get everything we need: common names, the current
realm, symbols, arguments, the heap, and a few other things.

In some places we already don't actually need a global object and just
do it for consistency - no more `auto& vm = global_object.vm();`!

This will eventually automatically fix the "wrong realm" issue we have
in some places where we (incorrectly) use the global object from the
allocating object, e.g. in call() / construct() implementations. When
only ever a VM is passed around, this issue can't happen :^)

I've decided to split this change into a series of patches that should
keep each commit down do a somewhat manageable size.

Userland/Libraries/LibJS/Runtime/Intl/DisplayNames.h

@@ -70,7 +70,7 @@ private:
     Optional<LanguageDisplay> m_language_display {}; // [[LanguageDisplay]]
 };
 
-ThrowCompletionOr<Value> canonical_code_for_display_names(GlobalObject& global_object, DisplayNames::Type type, StringView code);
+ThrowCompletionOr<Value> canonical_code_for_display_names(VM&, DisplayNames::Type, StringView code);
 bool is_valid_date_time_field_code(StringView field);
 
 }