R1:827aa05a676e

Drop Windows-specific SSH code

Summary: Ref T2015. This code is only relevant when attempting to run commands on a Windows host over SSH. Since SSH on Windows is extremely fragile and hard to maintain, and WinRM is a better long-term solution, drop this code (which will end up being unused when later diffs introduce the WinRM command interface).

Test Plan: This code won't be used when D10495 lands.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

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