Backport of disable printing flags warning message for the ssh command into release/1.12.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #20502 to be assessed for backporting due to the inclusion of the label backport/1.12.x.

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The below text is copied from the body of the original PR.

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Addresses #19785

Echoing what @maxb has mentioned in the ticket:

The vault ssh command has the unusual purpose of being a wrapper that invokes the real ssh command (after obtaining credentials). 
Moreover, the ssh command can take another command on its command line, to run on the remote machine. 
Because of this, there are multiple ways in which it can be a normal use-case for there to be option-like arguments later in the command line, 
which are deliberately intended either for ssh, or for a command being run via ssh on the remote machine.

This is quite unlike most other commands, where option-like things occurring after positional arguments are often a mistake.

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Overview of commits

• c93f4aa

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[hghaf099]

closing in favour of #20544