Make it an enum class too, and fix all the enums to follow style guide.

Fixes a -Wshadow warning, NONE shadows PropertyAttributes::None.

Bug: v8:12244,v8:12245
Change-Id: I9a8181a35d5690a32a6ce58587f0d8704aa1ab40
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3291696
Auto-Submit: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78062}