Fix server crash when multiple threads call IODispatcher

[jageall]

Fixed: Exception in scheduled message callback crashes server
Fixed: IODispatcher is now threadsafe for request tracking

[timothycoleman]

need if here too

[timothycoleman]

i see you added the if's for the happy paths :)
just one more left which i commented above

[github-actions]

🚨 @timothycoleman Failed to create cherry Pick PR due to error:

RequestError [HttpError]: Merge conflict
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🚨👉 Check https://github.com/EventStore/EventStore/actions/runs/1436769477