feat(reactive): Cancel an effect's in-progress run when it is destroyed - #2515

feat(reactive): Cancel an effect's in-progress run when it is destroyed#2515

schloerke wants to merge 8 commits into

schloerke/async-pr-2182-reimplposit-dev/py-shiny:schloerke/async-pr-2182-reimplfrom

schloerke/async-session-end-cancelposit-dev/py-shiny:schloerke/async-session-end-cancelCopy head branch name to clipboard