Merge branch 'ab/hooks-regression-fix'

In Git 2.36 we revamped the way how hooks are invoked. One change that is end-user visible is that the output of a hook is no longer directly connected to the standard output of "git" that spawns the hook, which was noticed post release. This is getting corrected. * ab/hooks-regression-fix: hook API: fix v2.36.0 regression: hooks should be connected to a TTY run-command: add an "ungroup" option to run_process_parallel()