Bug 485068

SUMMARY
I have entries like below to ~/.ssh/config (the below is just an example, I do have other hosts configured to use specific ssh keys)

In dolphin if i enter fish://some_local_host, it asks for username and password even if the IdentityFile is set in the config file, if I connect using ssh from terminal, `ssh some_local_host`, it connects and does not ask for username and password

```
Host some_local_host
  User redacted
  HostName 192.168.1.23
  Port 22
  IdentityFile ~/.ssh/id_rsa_some_host
```

STEPS TO REPRODUCE
1. Configure host in ~/.ssh/config that has IdentityFile
2. Open Dolphin and type fish://[name_of_the_host_from_config_file]


OBSERVED RESULT
A popup dialog appears asking for username and password

EXPECTED RESULT
Connections should be created without asking for username and password (if the server does not ask for username/password)

SOFTWARE/OS VERSIONS
Windows: -
macOS: -
Linux/KDE Plasma: Kubuntu23.10 / 5.27.8
(available in About System)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
This functionality was working as expected in Kubuntu 22.04 before the latest updates