fixes#18199
Corrects handling of paths with spaces in the `Match !exec` clause we
use to determine whether Coder Connect is running. This is handled
differently than the ProxyCommand, so we have a different escape
routine, which also varies by OS.
On Windows, we resort to a pretty gnarly hack, but it does work and I
feel the only other option would be to reduce functionality such that we
could not detect the Coder Connect state.
