[27.x backport] cli/connhelper: getConnectionHelper: move ssh-option funcs out of closure #5392
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backport: cli/connhelper: getConnectionHelper: move ssh-option funcs out of closure #5345
relates to ssh: fix error on commandconn close, add ping and default timeout #4226
relates to disable pseudoterminal creation #5320
The addSSHTimeout and disablePseudoTerminalAllocation were added in commits a5ebe22 and f3c2c26, and called inside the Dialer function, which means they're called every time the Dialer is called. Given that the sshFlags slice is not mutated by the Dialer, we can call these functions once.
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