homed: do not log new password when debug logs are enabled

homed: do not log new password when debug logs are enabled

systemd-homed[3443]: Sending to worker:
{
  "enforcePasswordPolicy": false,
  "userName": "foobarbaz",
  "perMachine": [
    {
      "storage": "directory",
      "matchMachineId": "c1082742b92c4f7e8d30d6b17f9d3351"
    }
  ],
  "disposition": "regular",
  "lastChangeUSec": 1750606709833174,
  "lastPasswordChangeUSec": 1750606709833174,
  "privileged": {
    "hashedPassword": [
      "$y$j9T$ai2Fshq0ev9W05WL4SoRJ1$EFfe41ACrJKXMCQ83A05n6UW.HrRr9/O4b1x0CXgAXD"
    ]
  },
  "binding": {
    "c1082742b92c4f7e8d30d6b17f9d3351": {
      "blobDirectory": "/var/cache/systemd/home/foobarbaz",
      "uid": 60056,
      "gid": 60056
    }
  },
  "secret": {
    "password": [
      "test"
    ]
  },
  "__systemd_homework_internal_blob_fdmap": {}
}

(cherry picked from commit e248790263b63822cdffa399b593a272d7abddc8)