Make use of user configured sshkeys in chatflows sshkey step

[AhmedSa-mir]

Description

Now user can add his own ssh keys from admin dashboard #1537. We should make use of these keys in the chatflow sshkey upload step.

Implementation

If we want to allow user to upload key or select a configured key, maybe we need to introduce a new change in chatflows engine to be able to use two components in the same screen.