Simplify the smck OOA verification and refactor smck verifications fix 2462, 2463#2468

jeromekelleher merged 1 commit intotskit-dev:maintskit-dev/msprime:mainfrom

hossam26644:fix/test-ooa-takes-too-long-2462hossam26644/msprime:fix/test-ooa-takes-too-long-2462Copy head branch name to clipboard