Originally: https://gitlab.wikimedia.org/repos/ci-tools/patchdemo/-/issues/600
Consider not posting in phab when a patchdemo gets deleted. It creates email noise and phab comment noise on old tickets. I think folks can discover that a patchdemo is deleted when they click on the link and encounter an error message, and that it probably doesn't need a separate notification.
This error message could possibly use improvement though. This is what the user sees when they visit a deleted patch demo:
Perhaps it can explicitly say if it was deleted?