Add support for SOCKS proxy to check-mirrors

So far check-mirror is run on lizard but if we want to be able to run it on our machines, it would be useful to allow using it through a proxy server for all network operations.

To do that we can try the ruby-em-socksify library.

Feature Branch: check-mirrors.git:8054/torsocks-support

Subtasks

#8074 (closed)
#9548 (closed)
#9549 (closed)

Related issues

Related to #11736 (closed)
Related to #7667 (closed)

Original created by @sajolida on 8054 (Redmine)

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