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Improvement of poo#7086.

Currently the worker version checking is being done when the worker sends worker_status messages.

This raises some problems:

1- It's slow. To address some scalability issues, every worker has a different time of polling the server. Sometimes take less time, sometimes takes more time.
This is only noticeable when we have dozens (or maybe hundreds) of workers

2- If the server has jobs to be ran in the queue, it will send immediately the job, and then later it will do the version verification. This makes the job in scheduled state until the verification is done (related with previous point #1)

The solution for this is to move the verification from the worker status message to the websocket connection.