hooks: add hook for rejecting root commits

6 jobs for reject-separate-root-hook
Status Job ID Name Coverage
  External
failed kwrobot-branch-check

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

failed rust-git-hooks-megas-linux-debug

00:00:04