[test] Improve test coverage for Object::GetPropertyNames

- Cover array-indices corner cases around 2**32

Bug: v8:8019
Change-Id: Ic5d81a6944b10067b64ffc596472c076adc49c75
Reviewed-on: https://chromium-review.googlesource.com/1163786Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54936}