test: cleanup orphaned connections in CMAP tests
test: cleanup orphaned connections in CMAP tests

Certain CMAP tests may check connections out to explore pool
behavior, and fail to instruct the runner to check them back in,
leaving leaked connections in the wild. Since we already track
named connection, we will clean those up if they haven't been
checked back in, and start tracking unnamed checked out connections

mongodb/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native