Fix connection to dekstop access service when session MFA is required #30882
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Recently introduced multiplexer listener for desktop access resulted in a problem with connection when session MFA was required - we initiated connection first, then tried to issue certificate, which could require MFA check and that would lead to timeout in multiplexer, since there was no data on the connection while user was doing MFA check and so multiplexer couldn't peek the data. This PR changes order of operation - now we first try to issue certificate (with MFA check if required) and only then initiate the connection.