Require user password for SSH key upload and removal

[cotosso]

The current UI allows SSH keys to be uploaded or removed on the firewall without requiring additional user verification.

Proposed Solution

Require users to provide their account password before uploading or removing an SSH key via the UI.
Update the API to validate the user’s password as part of the SSH key upload or removal request.

[gsanchietti]

A correct password validation for such usage scenario requires a new API inside the api-server and must be implemented after: #1023