Metal: Remove obsolete workarounds Removed Intel-specific Metal workarounds that are not used on macOS 12 and later. Removed a redundant version check. Bug: angleproject:427600175 Change-Id: I34c7e53108f7e030512c9436ab2b9ae38ad17946 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6672312 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>