LibJS: Remove GlobalObject from VM::throw_completion()

This is a continuation of the previous five commits.

A first big step into the direction of no longer having to pass a realm
(or currently, a global object) trough layers upon layers of AOs!
Unlike the create() APIs we can safely assume that this is only ever
called when a running execution context and therefore current realm
exists. If not, you can always manually allocate the Error and put it in
a Completion :^)

In the spec, throw exceptions implicitly use the current realm's
intrinsics as well: https://tc39.es/ecma262/#sec-throw-an-exception

Userland/Libraries/LibJS/Runtime/Temporal/DurationConstructor.cpp

@@ -42,7 +42,7 @@ ThrowCompletionOr<Value> DurationConstructor::call()
 
     // 1. If NewTarget is undefined, then
     // a. Throw a TypeError exception.
-    return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, "Temporal.Duration");
+    return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, "Temporal.Duration");
 }
 
 // 7.1.1 Temporal.Duration ( [ years [ , months [ , weeks [ , days [ , hours [ , minutes [ , seconds [ , milliseconds [ , microseconds [ , nanoseconds ] ] ] ] ] ] ] ] ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.duration