Metal: Enable end2end tests. Explicitly disabled tests: - DifferentStencilMasksTest.DrawWithDifferentMask - PointSpritesTest.PointSizeAboveMaxIsClamped - WebGL2ReadOutsideFramebufferTest.CopyTexSubImage3D Bug: angleproject:2634 Change-Id: I76ab450c06d0e1be1e7469a8b9c6497684c3ca54 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1906607 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>