Use CopyNameAndLength in Snapshot.wrap

[andreubotella]

This uses the CopyNameAndLength AO defined in the ShadowRealm proposal to address the unexpected behavior of the length property discovered in https://github.com/tc39/test262/pull/3874/files#r1501253279.

[andreubotella]

While working on the engine262 and test262 changes, I noticed that this runs into a spec assertion: CreateBuiltinFunction already calls SetFunctionName and SetFunctionLength, and both of those functions assert that the function object doesn't already have the "name"/"length" property, so calling them again from CopyNameAndLength wouldn't be allowed.

Neither ShadowRealm's WrappedFunctionCreate nor Function.prototype.bind use CreateBuiltinFunction, instead making a new basic object with a [[Call]] method. I wonder if we should do the same, or maybe make a CreateRawBuiltinFunction that doesn't set the length and name.

[legendecas]

@andreubotella ah, you are right, https://tc39.es/ecma262/#sec-setfunctionname asserts that the function object has no "name" own property. Setting name twice would run into that assert.