[stable-3.13] nmc/3185-Encrypt-Socket-Request-Fix

[memurats]

when receiving a shell integration socket command for ENCRYPT, a generic interface and generic code paths was used

the assumption was that the listener socket would need (and remain) valid while hanlding teh request

some code paths need to display error messages to the user via a QMessageBox

the issue is that this will execute a Qt event loop that will handle the socket disconnection while the socket variable from the caller seems it will stay valid and alive

prevent that by not using a blocking method invocation such that life time mishandling about the socket listener is not possible