Automatic merge from submit-queue

Fix killing child sudo process in e2e_node tests

Fixes #29211; re-doing #29380 which was reverted due to cross-platform build failure #29669.

The context is we are trying to kill a process started as `sudo kube-apiserver`, but `sudo` ignores signals from the same process group. Applying `Setpgid` means the `sudo kill` process won't be in the same process group, so will not fall foul of this nifty feature.

~~I also took the liberty of removing some code setting `Pdeathsig` because it claims to be doing something  in the same area, but actually it doesn't do that at all.  The setting is applied to the forked process, i.e. `sudo`, and it means the `sudo` will get killed if we (`e2e_node.test`) die.  This (a) isn't what the comment says and (b) doesn't help because sending SIGKILL to the sudo process leaves sudo's child alive.~~

We do need to use the same 'hack' to access `Setpgid` as the `e2e_node.test` program gets built on Windows (although it doesn't run there).

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