Metal: Remove UseResource old SDK fallbacks Fixes deprecation compile errors on newer SDKs. Remove the version guards, the useResource API is available on: macOS 10.15, minimum supported version 10.15 iOS 13, minimum supported version 15 macCatalyst 13.1, minimum supported version 16.6 (for macOS 13.5) Bug: angleproject:360147118 Change-Id: I6d2dd7cb510d6134b75d4479ae7159b8fbcfc96b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5796002 Commit-Queue: Geoff Lang <geofflang@chromium.org> Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Alexey Knyazev <lexa.knyazev@gmail.com>