Remove GrLayerHoister

This relies on https://codereview.chromium.org/1944013002/ (Add legacy flag to allow Skia to remove Ganesh layer hoister) landing first so as to not break the DEPS roll.

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1950523002

Review-Url: https://codereview.chromium.org/1950523002
31 files changed