lava: Drop a bunch of spurious `name:` keys

Validating the job definitions when resubmitting them yields:

    Valid definition with warnings:
      extra keys not allowed
      @ data['actions[4]']['test']['definition']['name']

Get rid of those extra keys to make LAVA happier.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>