[8.x.x backport] Fix issues with history sampling and hw dynamic res#1777

sebastienlagarde merged 2 commits into8.x.x/hd/stagingUnity-Technologies/Graphics:8.x.x/hd/stagingfrom

8.x.x/hd/fix-taa-issue-hw-dyn-resUnity-Technologies/Graphics:8.x.x/hd/fix-taa-issue-hw-dyn-resCopy head branch name to clipboard