[3.14] gh-114177: avoid calling connection lost callbacks when loop is already closed in asyncio subprocess (GH-134508) (#134561)

gh-114177: avoid calling connection lost callbacks when loop is already closed in asyncio subprocess (GH-134508)
(cherry picked from commit 5804ee7b467d86131be3ff7d569443efb0d0f9fd)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>