Core Leaks Websocket Sessions

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Bug Report

It was noticed that in certain scenarios Core will leak websocket sessions.

Reproduction Steps

1. Connect a websocket client (https://www.websocket.org/echo.html connect to wss://$CORE_IP:2020)
2. Kill the websocket client without properly closing the connection (refresh the page)
3. run this command from build/bin

lsof -p `cat core.pid` | grep "CLOSE_WAIT"

Expected Behavior

Core has no connections in CLOSE_WAIT status

Observed Behavior

Core has leaked a connection in CLOSE_WAIT status

OS & Version Information

• SDL Core Version: develop

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Closed via #3696