Remove StrictHostKeyChecking=no and implement proper host key verification

Addresses security concerns from OWASP audit by enforcing strict host key
verification.

Changes:
- Replaced StrictHostKeyChecking=accept-new with yes in pkg/container and devops.
- Removed insecure host key verification from pkg/ansible.
- Added synchronous host key discovery using ssh-keyscan during VM boot.
- Updated Boot lifecycle to wait for host key verification.
- Handled missing known_hosts file in pkg/ansible.
- Refactored hardcoded SSH port to DefaultSSHPort constant.
- Fixed formatting issues identified by QA check.

pkg/io/local/client.go

@@ -48,7 +48,6 @@ func (m *Medium) path(p string) string {
 		return clean
 	}
 
-
 	// Join cleaned relative path with root
 	return filepath.Join(m.root, clean)
 }