The cancellation of read and write inactivity tasks was done via
WebSocketHandler#afterConnectionClosed, relying on the WebSocket
library to always invoke the callback.
This change moves the cancellation to the `close` method instead
that in turn is called from DefaultStompSession#resetConnection,
in effect making the cancellation more proactive and aligned with
connection cleanup in DefaultStompSession vs relying on a
subsequent call from the WebSocket library after the connection
is closed.
Closes gh-32195
2dd22f64e1