`gh aw` has problems with Ctrl-C on WSL

[dsyme]

I've noticed all sorts of problems with Ctrl-C for commands like gh aw run repo-assist --repeat 20, gh aw add-wizard and pretty much all gh commands

Weirdly the process seems to keep running after a Ctrl-C

We should do a deep, end to end review of how we handle Ctrl-C and "finally" actions on exit from the process and make appropriate cleanup and fixes so the Ctrl-C does the sensible, expected thing on all paths woth clean, obviously correct code.