LibJS+LibWeb: Remove a bunch of calls to Interpreter::global_object()

Objects should get the GlobalObject from themselves instead. However,
it's not yet available during construction so this only switches code
that happens after construction.

To support multiple global objects, Interpreter needs to stop holding
on to "the" global object and let each object graph own their global.

Libraries/LibJS/Runtime/ErrorConstructor.cpp

@@ -55,7 +55,7 @@ Value ErrorConstructor::construct(Interpreter& interpreter)
         if (interpreter.exception())
             return {};
     }
-    return Error::create(interpreter.global_object(), "Error", message);
+    return Error::create(global_object(), "Error", message);
 }
 
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName)                                          \