hostagent: Log ssh forwarding command

We log a message when forwarding to guest unix socket, but it is not
clear from the log how this is implemented, and the code is confusing
(using ssh forwarding when using GRPC forwarding). Let's make this more
clear by logging the ssh forwarding command.

Example logs:

    {"level":"debug","msg":"Forwarding unix sockets","time":"2025-07-06T15:59:43+03:00"}

    {"level":"info","msg":"Forwarding \"/run/user/501/podman/podman.sock\" (guest) to
        \"/Users/nir/.lima/podman/sock/podman.sock\" (host)","time":"2025-07-06T15:59:43+03:00"}

    {"level":"debug","msg":"Running \"/usr/bin/ssh -F /dev/null -o IdentityFile=\\\"/Users/nir/.lima/_config/user\\\"
        -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o NoHostAuthenticationForLocalhost=yes
        -o PreferredAuthentications=publickey -o Compression=no -o BatchMode=yes -o IdentitiesOnly=yes
        -o GSSAPIAuthentication=no -o Ciphers=\\\"^aes128-gcm@openssh.com,aes256-gcm@openssh.com\\\" -o User=nir
        -o ControlMaster=auto -o ControlPath=\\\"/Users/nir/.lima/podman/ssh.sock\\\" -o ControlPersist=yes -T
        -O forward -L /Users/nir/.lima/podman/sock/podman.sock:/run/user/501/podman/podman.sock -N -f -p 53505
        127.0.0.1 --\"","time":"2025-07-06T15:59:43+03:00"}

Signed-off-by: Nir Soffer <nirsof@gmail.com>

Author: nirs

pkg/hostagent/hostagent.go

@@ -758,6 +758,7 @@ func forwardSSH(ctx context.Context, sshConfig *ssh.SSHConfig, port int, local,
 		}
 	}
 	cmd := exec.CommandContext(ctx, sshConfig.Binary(), args...)
+	logrus.Debugf("Running %q", cmd)
 	if out, err := cmd.Output(); err != nil {
 		if verb == verbForward && strings.HasPrefix(local, "/") {
 			if reverse {