Earlier quoted context omitted.
Depending on your podcast player, what would be "next track" in a music app is "skip N seconds." I double tap my headphones and skip the ad. It doesn't work in the basic Apple podcasts app, but that app stinks and Pocket Casts is now free to use.
Oops, sorry; yeah, I forgot to specify the app being Overcast. Though without firing up the machinery to confirm, I believe on the watch it's just using Apple's Now Playing? Or maybe not. Anyway, to be specific, on the Apple watch there are buttons on either side of play/pause; one goes back 30 seconds, one goes forward.
Dunno about the watch, but in Pocket Casts +30 works with CarPlay and my car's physical controls.