Necessary when the libssh2/libssh client library does not support KEX
algos offered by default by the OpenSSH server. E.g. libssh2 with WinCNG
combined with OpenSSH 10+.
Also: use this option in GHA/windows.
Follow-up to 3b8bb1a86a#21219
Follow-up to c98d0a2e9a#21220Closes#21438