`<index> in <typed array>` and `"length"/method in <typed array>` report false

[proggeramlug]

Summary

<index> in <typed array> returns false for valid in-bounds indices, and
<method> in <typed array> / "length" in <typed array> also report false.

Repro

const ta = new Uint8Array([10, 20, 30]);
console.log(0 in ta);          // node: true   perry: false
console.log(2 in ta);          // node: true   perry: false
console.log(3 in ta);          // node: false  perry: false ✓
console.log("length" in ta);   // node: true   perry: false
console.log("subarray" in ta); // node: true   perry: false

Notes

Pre-existing (reproduces on main). The typed-array arm in
js_object_has_property (has_property.rs) is reached only when
lookup_typed_array_kind matches; a small typed array whose backing is
off-heap (no GcHeader) appears not to resolve there, so in falls through and
reports absent. Separate from the Object.create in fix (#6145).